\documentclass[11pt,twoside]{article}\makeatletter

\IfFileExists{xcolor.sty}%
  {\RequirePackage{xcolor}}%
  {\RequirePackage{color}}
\usepackage{colortbl}
\usepackage{wrapfig}
\usepackage{ifxetex}
\ifxetex
  \usepackage{fontspec}
  \usepackage{xunicode}
  \catcode`⃥=\active \def⃥{\textbackslash}
  \catcode`❴=\active \def❴{\{}
  \catcode`❵=\active \def❵{\}}
  \def\textJapanese{\fontspec{Noto Sans CJK JP}}
  \def\textChinese{\fontspec{Noto Sans CJK SC}}
  \def\textKorean{\fontspec{Noto Sans CJK KR}}
  \setmonofont{DejaVu Sans Mono}
  
\else
  \IfFileExists{utf8x.def}%
   {\usepackage[utf8x]{inputenc}
      \PrerenderUnicode{–}
    }%
   {\usepackage[utf8]{inputenc}}
  \usepackage[english]{babel}
  \usepackage[T1]{fontenc}
  \usepackage{float}
  \usepackage[]{ucs}
  \uc@dclc{8421}{default}{\textbackslash }
  \uc@dclc{10100}{default}{\{}
  \uc@dclc{10101}{default}{\}}
  \uc@dclc{8491}{default}{\AA{}}
  \uc@dclc{8239}{default}{\,}
  \uc@dclc{20154}{default}{ }
  \uc@dclc{10148}{default}{>}
  \def\textschwa{\rotatebox{-90}{e}}
  \def\textJapanese{}
  \def\textChinese{}
  \IfFileExists{tipa.sty}{\usepackage{tipa}}{}
\fi
\def\exampleFont{\ttfamily\small}
\DeclareTextSymbol{\textpi}{OML}{25}
\usepackage{relsize}
\RequirePackage{array}
\def\@testpach{\@chclass
 \ifnum \@lastchclass=6 \@ne \@chnum \@ne \else
  \ifnum \@lastchclass=7 5 \else
   \ifnum \@lastchclass=8 \tw@ \else
    \ifnum \@lastchclass=9 \thr@@
   \else \z@
   \ifnum \@lastchclass = 10 \else
   \edef\@nextchar{\expandafter\string\@nextchar}%
   \@chnum
   \if \@nextchar c\z@ \else
    \if \@nextchar l\@ne \else
     \if \@nextchar r\tw@ \else
   \z@ \@chclass
   \if\@nextchar |\@ne \else
    \if \@nextchar !6 \else
     \if \@nextchar @7 \else
      \if \@nextchar (8 \else
       \if \@nextchar )9 \else
  10
  \@chnum
  \if \@nextchar m\thr@@\else
   \if \@nextchar p4 \else
    \if \@nextchar b5 \else
   \z@ \@chclass \z@ \@preamerr \z@ \fi \fi \fi \fi
   \fi \fi  \fi  \fi  \fi  \fi  \fi \fi \fi \fi \fi \fi}
\gdef\arraybackslash{\let\\=\@arraycr}
\def\@textsubscript#1{{\m@th\ensuremath{_{\mbox{\fontsize\sf@size\z@#1}}}}}
\def\Panel#1#2#3#4{\multicolumn{#3}{){\columncolor{#2}}#4}{#1}}
\def\abbr{}
\def\corr{}
\def\expan{}
\def\gap{}
\def\orig{}
\def\reg{}
\def\ref{}
\def\sic{}
\def\persName{}\def\name{}
\def\placeName{}
\def\orgName{}
\def\textcal#1{{\fontspec{Lucida Calligraphy}#1}}
\def\textgothic#1{{\fontspec{Lucida Blackletter}#1}}
\def\textlarge#1{{\large #1}}
\def\textoverbar#1{\ensuremath{\overline{#1}}}
\def\textquoted#1{‘#1’}
\def\textsmall#1{{\small #1}}
\def\textsubscript#1{\@textsubscript{\selectfont#1}}
\def\textxi{\ensuremath{\xi}}
\def\titlem{\itshape}
\newenvironment{biblfree}{}{\ifvmode\par\fi }
\newenvironment{bibl}{}{}
\newenvironment{byline}{\vskip6pt\itshape\fontsize{16pt}{18pt}\selectfont}{\par }
\newenvironment{citbibl}{}{\ifvmode\par\fi }
\newenvironment{docAuthor}{\ifvmode\vskip4pt\fontsize{16pt}{18pt}\selectfont\fi\itshape}{\ifvmode\par\fi }
\newenvironment{docDate}{}{\ifvmode\par\fi }
\newenvironment{docImprint}{\vskip 6pt}{\ifvmode\par\fi }
\newenvironment{docTitle}{\vskip6pt\bfseries\fontsize{22pt}{25pt}\selectfont}{\par }
\newenvironment{msHead}{\vskip 6pt}{\par}
\newenvironment{msItem}{\vskip 6pt}{\par}
\newenvironment{rubric}{}{}
\newenvironment{titlePart}{}{\par }

\newcolumntype{L}[1]{){\raggedright\arraybackslash}p{#1}}
\newcolumntype{C}[1]{){\centering\arraybackslash}p{#1}}
\newcolumntype{R}[1]{){\raggedleft\arraybackslash}p{#1}}
\newcolumntype{P}[1]{){\arraybackslash}p{#1}}
\newcolumntype{B}[1]{){\arraybackslash}b{#1}}
\newcolumntype{M}[1]{){\arraybackslash}m{#1}}
\definecolor{label}{gray}{0.75}
\def\unusedattribute#1{\sout{\textcolor{label}{#1}}}
\DeclareRobustCommand*{\xref}{\hyper@normalise\xref@}
\def\xref@#1#2{\hyper@linkurl{#2}{#1}}
\begingroup
\catcode`\_=\active
\gdef_#1{\ensuremath{\sb{\mathrm{#1}}}}
\endgroup
\mathcode`\_=\string"8000
\catcode`\_=12\relax

\usepackage[a4paper,twoside,lmargin=1in,rmargin=1in,tmargin=1in,bmargin=1in,marginparwidth=0.75in]{geometry}
\usepackage{framed}

\definecolor{shadecolor}{gray}{0.95}
\usepackage{longtable}
\usepackage[normalem]{ulem}
\usepackage{fancyvrb}
\usepackage{fancyhdr}
\usepackage{graphicx}
\usepackage{marginnote}

\renewcommand{\@cite}[1]{#1}


\renewcommand*{\marginfont}{\itshape\footnotesize}

\def\Gin@extensions{.pdf,.png,.jpg,.mps,.tif}

  \pagestyle{fancy}

\usepackage[pdftitle={Online Classroom Platforms: A Comprehensive Study in the Perspective of Bangladesh},
 pdfauthor={}]{hyperref}
\hyperbaseurl{}

	 \paperwidth210mm
	 \paperheight297mm
              
\def\@pnumwidth{1.55em}
\def\@tocrmarg {2.55em}
\def\@dotsep{4.5}
\setcounter{tocdepth}{3}
\clubpenalty=8000
\emergencystretch 3em
\hbadness=4000
\hyphenpenalty=400
\pretolerance=750
\tolerance=2000
\vbadness=4000
\widowpenalty=10000

\renewcommand\section{\@startsection {section}{1}{\z@}%
     {-1.75ex \@plus -0.5ex \@minus -.2ex}%
     {0.5ex \@plus .2ex}%
     {\reset@font\Large\bfseries}}
\renewcommand\subsection{\@startsection{subsection}{2}{\z@}%
     {-1.75ex\@plus -0.5ex \@minus- .2ex}%
     {0.5ex \@plus .2ex}%
     {\reset@font\Large}}
\renewcommand\subsubsection{\@startsection{subsubsection}{3}{\z@}%
     {-1.5ex\@plus -0.35ex \@minus -.2ex}%
     {0.5ex \@plus .2ex}%
     {\reset@font\large}}
\renewcommand\paragraph{\@startsection{paragraph}{4}{\z@}%
     {-1ex \@plus-0.35ex \@minus -0.2ex}%
     {0.5ex \@plus .2ex}%
     {\reset@font\normalsize}}
\renewcommand\subparagraph{\@startsection{subparagraph}{5}{\parindent}%
     {1.5ex \@plus1ex \@minus .2ex}%
     {-1em}%
     {\reset@font\normalsize\bfseries}}


\def\l@section#1#2{\addpenalty{\@secpenalty} \addvspace{1.0em plus 1pt}
 \@tempdima 1.5em \begingroup
 \parindent \z@ \rightskip \@pnumwidth 
 \parfillskip -\@pnumwidth 
 \bfseries \leavevmode #1\hfil \hbox to\@pnumwidth{\hss #2}\par
 \endgroup}
\def\l@subsection{\@dottedtocline{2}{1.5em}{2.3em}}
\def\l@subsubsection{\@dottedtocline{3}{3.8em}{3.2em}}
\def\l@paragraph{\@dottedtocline{4}{7.0em}{4.1em}}
\def\l@subparagraph{\@dottedtocline{5}{10em}{5em}}
\@ifundefined{c@section}{\newcounter{section}}{}
\@ifundefined{c@chapter}{\newcounter{chapter}}{}
\newif\if@mainmatter 
\@mainmattertrue
\def\chaptername{Chapter}
\def\frontmatter{%
  \pagenumbering{roman}
  \def\thechapter{\@roman\c@chapter}
  \def\theHchapter{\roman{chapter}}
  \def\thesection{\@roman\c@section}
  \def\theHsection{\roman{section}}
  \def\@chapapp{}%
}
\def\mainmatter{%
  \cleardoublepage
  \def\thechapter{\@arabic\c@chapter}
  \setcounter{chapter}{0}
  \setcounter{section}{0}
  \pagenumbering{arabic}
  \setcounter{secnumdepth}{6}
  \def\@chapapp{\chaptername}%
  \def\theHchapter{\arabic{chapter}}
  \def\thesection{\@arabic\c@section}
  \def\theHsection{\arabic{section}}
}
\def\backmatter{%
  \cleardoublepage
  \setcounter{chapter}{0}
  \setcounter{section}{0}
  \setcounter{secnumdepth}{2}
  \def\@chapapp{\appendixname}%
  \def\thechapter{\@Alph\c@chapter}
  \def\theHchapter{\Alph{chapter}}
  \appendix
}
\newenvironment{bibitemlist}[1]{%
   \list{\@biblabel{\@arabic\c@enumiv}}%
       {\settowidth\labelwidth{\@biblabel{#1}}%
        \leftmargin\labelwidth
        \advance\leftmargin\labelsep
        \@openbib@code
        \usecounter{enumiv}%
        \let\p@enumiv\@empty
        \renewcommand\theenumiv{\@arabic\c@enumiv}%
	}%
  \sloppy
  \clubpenalty4000
  \@clubpenalty \clubpenalty
  \widowpenalty4000%
  \sfcode`\.\@m}%
  {\def\@noitemerr
    {\@latex@warning{Empty `bibitemlist' environment}}%
    \endlist}

\def\tableofcontents{\section*{\contentsname}\@starttoc{toc}}
\parskip0pt
\parindent1em
\def\Panel#1#2#3#4{\multicolumn{#3}{){\columncolor{#2}}#4}{#1}}
\newenvironment{reflist}{%
  \begin{raggedright}\begin{list}{}
  {%
   \setlength{\topsep}{0pt}%
   \setlength{\rightmargin}{0.25in}%
   \setlength{\itemsep}{0pt}%
   \setlength{\itemindent}{0pt}%
   \setlength{\parskip}{0pt}%
   \setlength{\parsep}{2pt}%
   \def\makelabel##1{\itshape ##1}}%
  }
  {\end{list}\end{raggedright}}
\newenvironment{sansreflist}{%
  \begin{raggedright}\begin{list}{}
  {%
   \setlength{\topsep}{0pt}%
   \setlength{\rightmargin}{0.25in}%
   \setlength{\itemindent}{0pt}%
   \setlength{\parskip}{0pt}%
   \setlength{\itemsep}{0pt}%
   \setlength{\parsep}{2pt}%
   \def\makelabel##1{\upshape ##1}}%
  }
  {\end{list}\end{raggedright}}
\newenvironment{specHead}[2]%
 {\vspace{20pt}\hrule\vspace{10pt}%
  \phantomsection\label{#1}\markright{#2}%

  \pdfbookmark[2]{#2}{#1}%
  \hspace{-0.75in}{\bfseries\fontsize{16pt}{18pt}\selectfont#2}%
  }{}
      \def\TheFullDate{2021-07-15 (revised: 15 July 2021)}
\def\TheID{\makeatother }
\def\TheDate{2021-07-15}
\title{Online Classroom Platforms: A Comprehensive Study in the Perspective of Bangladesh}
\author{}\makeatletter 
\makeatletter
\newcommand*{\cleartoleftpage}{%
  \clearpage
    \if@twoside
    \ifodd\c@page
      \hbox{}\newpage
      \if@twocolumn
        \hbox{}\newpage
      \fi
    \fi
  \fi
}
\makeatother
\makeatletter
\thispagestyle{empty}
\markright{\@title}\markboth{\@title}{\@author}
\renewcommand\small{\@setfontsize\small{9pt}{11pt}\abovedisplayskip 8.5\p@ plus3\p@ minus4\p@
\belowdisplayskip \abovedisplayskip
\abovedisplayshortskip \z@ plus2\p@
\belowdisplayshortskip 4\p@ plus2\p@ minus2\p@
\def\@listi{\leftmargin\leftmargini
               \topsep 2\p@ plus1\p@ minus1\p@
               \parsep 2\p@ plus\p@ minus\p@
               \itemsep 1pt}
}
\makeatother
\fvset{frame=single,numberblanklines=false,xleftmargin=5mm,xrightmargin=5mm}
\fancyhf{} 
\setlength{\headheight}{14pt}
\fancyhead[LE]{\bfseries\leftmark} 
\fancyhead[RO]{\bfseries\rightmark} 
\fancyfoot[RO]{}
\fancyfoot[CO]{\thepage}
\fancyfoot[LO]{\TheID}
\fancyfoot[LE]{}
\fancyfoot[CE]{\thepage}
\fancyfoot[RE]{\TheID}
\hypersetup{citebordercolor=0.75 0.75 0.75,linkbordercolor=0.75 0.75 0.75,urlbordercolor=0.75 0.75 0.75,bookmarksnumbered=true}
\fancypagestyle{plain}{\fancyhead{}\renewcommand{\headrulewidth}{0pt}}

\date{}
\usepackage{authblk}

\providecommand{\keywords}[1]
{
\footnotesize
  \textbf{\textit{Index terms---}} #1
}

\usepackage{graphicx,xcolor}
\definecolor{GJBlue}{HTML}{273B81}
\definecolor{GJLightBlue}{HTML}{0A9DD9}
\definecolor{GJMediumGrey}{HTML}{6D6E70}
\definecolor{GJLightGrey}{HTML}{929497} 

\renewenvironment{abstract}{%
   \setlength{\parindent}{0pt}\raggedright
   \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}}
   \vskip16pt
   \textcolor{GJBlue}{\large\bfseries\abstractname\space}
}{%   
   \vskip8pt
   \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}}
   \vskip16pt
}

\usepackage[absolute,overlay]{textpos}

\makeatother 
      \usepackage{lineno}
      \linenumbers
      
\begin{document}

             \author[1]{AHM Saiful  Islam}

             \author[2]{Md Sanju  Islam}

             \author[3]{Shaheena  Sultana}

             \author[4]{Maria  Islam}

             \affil[1]{  Notre Dame University Bangladesh}

\renewcommand\Authands{ and }

\date{\small \em Received: 8 June 2021 Accepted: 5 July 2021 Published: 15 July 2021}

\maketitle


\begin{abstract}
        


Education is the backbone of a nation. So every nation emphasizes it with their highest value as development is mostly dependent on education. In the modern era, online classroom conditions naturalized through specialized video conferencing applications. There may be students and instructors to take the class as a traditional classroom. There is at least one current tutor present, and the lesson is completed in real- time at a fixed time, with the students being present. Here, students and teachers can genuinely engage in class. However, a class does not always need a live teacher to inspect students; they can also proceed to their desired place. Sometimes there may be no teacher at all. This type of online classroom is an unsupervised online classroom. It is distinguished by ready-made lessons that the students can receive without the help of an instructor. Examinations can also be automated in this system. So, in any situation and place, an online class can be taken. At the time of COVID-19, all over the world, people are in crisis and are locked down in their houses. The traditional educational system is facing more trouble to continue its activities. In the traditional system, some teachers used to teach various subjects in front of their students in an educational institution.

\end{abstract}


\keywords{education, online, classroom, COVID-19.}

\begin{textblock*}{18cm}(1cm,1cm) % {block width} (coords) 
\textcolor{GJBlue}{\LARGE Global Journals \LaTeX\ JournalKaleidoscope\texttrademark}
\end{textblock*}

\begin{textblock*}{18cm}(1.4cm,1.5cm) % {block width} (coords) 
\textcolor{GJBlue}{\footnotesize \\ Artificial Intelligence formulated this projection for compatibility purposes from the original article published at Global Journals. However, this technology is currently in beta. \emph{Therefore, kindly ignore odd layouts, missed formulae, text, tables, or figures.}}
\end{textblock*}


\let\tabcellsep& 	 	 		 
\section[{Introduction}]{Introduction}\par
ducation has changed a lot in the last couple of decades. Technology has completely changed our learning experience and has made it more fruitful. Education must originate with these new learning styles. For instance, a popular way of Accommodating these new learning styles is through virtual classrooms or online classrooms. An online classroom is an educational ambiance where users can interlude, convey aspects, and concern with educational resources at the time of performing in a virtual place. The medium is mostly through a video-conferencing application. It allows many participants through the internet to be connected at the same time from anywhere in the world. An online classroom is also called a virtual learning environment (VLE). With the online environment, concepts and collaborators are never far away. Mobile accessibility also grants participants greater flexibility. Students are working with each other more than ever because of virtual classrooms. One of the identifying features of separating online learning conditions from typical classrooms is the flexibility of the way lessons are offered. In traditional learning, students sit in a classroom, listening to a teacher, and taking notes. On the contrary, virtual classrooms give learners greater liberty to engage with the components creatively and react based on their inputs. Traditional learning tends to be synchronous, where virtual learning seems to be asynchronous. Online classrooms deliver new modes for tutors to give radiating, amusing, and efficient learning resources. So, innovation is the hallmark of online learning-for, both learners and lecturers. Some interactive online classrooms are Gamified lessons, flipped classrooms, and scenario learning. And there are also a lot of virtual classroom options available with both free and cost  {\ref [3]}. Today all over the world people are facing much trouble for the pandemic COVID-19. People are locked down in their homes. And the virus is spreading at high speed. As per the last update of the World Health Organization on 20 April 2020 (06:00 GMT+6), there are 2314621 confirmed cases, 157847 confirmed deaths and 213 countries, areas, or territories are with COVID-19. Every institutional function, excluding emergency services and limited hour bank services, has been closed for an uncertain time. There is no perfect assumption when to get on the daily activities \hyperref[b0]{[1]} We have started with the Introduction part in Section I. In the next sections, we have discussed the online classroom and its benefits, limitations, and future. Section III represents the insights of mobile and internet in Bangladesh. Section VI introduces our online educational activities in Bangladesh. In Section VIII, we have made a comparison of various online classroom platforms in detail. Section IX concludes the paper. 
\section[{II.}]{II.} 
\section[{The Online Classroom}]{The Online Classroom}\par
An online classroom is an internet-based, flexible, afford-able, and non-restricting learning environment that sanctions teachers and students to cohere, interlude, assist and illustrate conjectures. It has tumbled most of the usual obstructions to synchronous learning: cost, distance, and timing. An online classroom should have some features \hyperref[b26]{[35]}[3]. Such as:\par
? Video conferencing capability, so lecturers and learners can see each other. ? Audio conferencing ability to hear each other.\par
? Real-time text chats, for messaging each other.\par
? Interactive online whiteboard to interact much more col-laboratively and not just rely on video or audio. ? Library of learning materials so that teachers can provide more relevant, rich, and structured lessons to the students. ? Teacher tools and controls just like in a physical class-room to monitor the class and are much more feasible online. 
\section[{III. Benefits of Online Classroom}]{III. Benefits of Online Classroom}\par
There is much coherence between a traditional education system and an online classroom. Learning through an online classroom gives many advantages that the campus-based sys-tem doesn't provide. A few have made a list of top benefits [3] \hyperref[b25]{[33]} [34] \hyperref[b24]{[32]}. For instance:\par
? Access to Class from Anywhere: In any situation, classes can be taken online at any place. All one needs is a laptop or other digital device.  
\section[{IV. Limitations of Online Classroom}]{IV. Limitations of Online Classroom}\par
Online education has many profits to deliver, still unluckily; there are some losses also. Demerits are not much as the merits without doubt, but there are indeed some views of the online classroom that some sharers might take as inadvertence. Few main limitations have made a list \hyperref[b1]{[4]}. Such as,\par
? Higher Internet Cost: Strong internet availability is the foremost thing to be in the online classroom. But it is a matter of sorrow that it is not possible to provide a reliable connection all the time and everywhere. But it cost much to get this kind of connection.\par
? Additional Digital Training: Additional digital training is another limitation of the online classroom.\par
Perceiving online learning completely is essential for the online classroom. Some of the tutors and students do not maintain proper lessons of using the given e-Learning gadgets. So, they face difficulties to interact and attain these gadgets. ? Infrastructure Challenges: There is a requirement of using advanced technology and proper network infrastructure for establishing an online classroom.\par
We have many affordable and feasible resolutions for the ascending necessity and adaptability of online classes. But some of the organizations might not propose to offer it for its high-cost installation.\par
V. 
\section[{Future of Online Classroom}]{Future of Online Classroom}\par
In the upcoming time, we hope for the online classroom to spread more AI and VR. As the virtual classroom is enduring to spread, we expect to have more innovation in emerging technologies. At the forefront are Artificial Intelligence and Virtual Reality. While these are still searching their footing, they are on their way and will have numerous applications across learning platforms in the coming years. There has been much enhancement in the improvement of electronic media from the beginning of the last century. We have surpassed the obstacles of costly and speedy internet. So, many neoteric organizations have manifested to fully incorporate e-Learning through an online classroom. So that they can simplify learning and development for both employees and learners. Now we can have field visits just by sitting in a classroom. Nevertheless, tech organizations such as Google have now made it true with their virtual reality system. Technological advancements are now switching educational stages. It is also making them free from time and physical location. Today, online classrooms have already stepped into the learning world. A lot of innovations are on their way of coming to the education sector with these. There will be a classroom scenario treating an e-Learning framework with absolute exactness. It will anticipate the learners to forget about their actual presence and the long distance between them and the instructor in the future. 
\section[{VI.}]{VI.} 
\section[{Internet and Mobile Insight of Bangladesh}]{Internet and Mobile Insight of Bangladesh}\par
Bangladesh is a south-east Asian country with a small area. But it has a large population where its literacy rate is rising day by day. And it is a land of opportunities where digitalization is making its way into the deep. Traditional and online activities are both active in the field of education here. Anyone with a desktop or laptop or mobile can be connected to the virtual world with an internet connection. In Table  {\ref ?} Without having a strong internet connection it is not possible to get into Online Classroom. Though it is costly to get a better one here a good one can be got within a reasonable rate here. From the perspective of Bangladesh, we can see the internet speeds in Table \hyperref[tab_3]{3}. Most of the people in our country use mobile phones heavily in their daily activities. As technological kinds of stuff cost more in this country, people are satisfied with their computer alike mobile phones. And it is possible to get a smartphone at a reasonable price as we have many mobile manufacturers here. Here in Table \hyperref[tab_4]{4}. we see the mobile connection types in our country.  
\section[{percent}]{percent}\par
Previously we have described mobile manufacturers in Bangladesh. Mobile is like a small computer with a lot of advantages. So, with the statistics, we can say that it is feasible to maintain online classroom activities in a developing country named Bangladesh. And it will be able to contribute to building a Digital Bangladesh.  
\section[{VII. Online Classroom Activities in Bangladesh}]{VII. Online Classroom Activities in Bangladesh}\par
Bangladesh is a developing country. It is emerging day by day with its resources. Though traditional systems are more happening here now a day's new techno-logical system is also preferable with the traditional one. So, online classroom activities have also been started with a limited portion in Bangladesh. Bangladesh has a huge education society containing many institutions and its teachers and students. We can observe the quantity from Table \hyperref[tab_1]{1}. Like other people in the world, the people of Bangladesh are also facing a crisis at the time of COVID-19. It is so dangerous that life has been stuck in homes for days long as per the Government's Rule and Safety. All the institutions excluding emergency services and banking are closed in most of the countries. So, all educational institutions are also closed. But they are facing many problems to continue one of the noblest things in the world, and that is Educating. So they are shifting their classes to an online setting. Going through Fig.  {\ref 8}, we can see there are a huge number of students studying at different educational institutions in Bangladesh. They can surely be benefited from the online classroom platforms. At this crisis moment like COVID-19, teachers of different educational institutions are instructed to take their classes online. Like other private universities in Bangladesh, Notre Dame University Bangladesh is also taking its classes in online classrooms. Faculties and students are also taking their classes regularly at their routine time. So that they can get enough time to do their other work. And mainly to be at home, which is the main thing to be safe in the COVID-19 situation. All the people are playing their roles in tackling this tough situation.\par
Quality teaching and ethical formation have been conferring and rendering to youngsters by the Holy Cross Congregation in Bangladesh. Most of them have attained competency in various occupations. They have also stood out as committed citizens to serve Bangladesh with inscription. 'Notre Dame' is a brand that symbolizes excellence in the education sector of Bangladesh. At the crisis moment like COVID-19, they are continuing their educational activities on online platforms. So that the students don't face any kind of study-related problem in their career.\par
VIII. 
\section[{An Overview of Online Classroom Platforms}]{An Overview of Online Classroom Platforms}\par
Online classroom and learning activities are being incorporated by numerous organizations. They are now working with the advancement of online classroom software and tools. But it is difficult to ensure learner's inclination with both innovating educational stages and advancement in technology. Here we have discussed various online classroom platforms with their features, prices and sources in Table \hyperref[tab_7]{7} to 10: Single license for USD19 a month, Team license for USD239 a month (includes 10 virtual meeting rooms).\par
[5]\par
( ) 
\section[{H}]{H}\par
Year 2021 
\section[{ProfiConf}]{ProfiConf}\par
Cutting-edge security to keep data safe, web-based solution without the need to download anything, share screens, ability to record the conference.\par
Free plan for meetings with up to 2 participants, Pro plan is priced at USD12 per month, and the Premium plan costs USD25 per month.\par
[7] ezTalks HD Video-Audio calling, file screen sharing, instant messaging, interactive whiteboard.\par
The Standard, Pro and Business plans (for 100, 200 and 300 attendees) cost USD13, USD39, and USD65 \hyperref[b8]{[11]} Web Room Document and File sharing, screenapplication sharing, interactive whiteboard.\par
per month Free \hyperref[b21]{[28]} BlueJeans Real-time Intelligence, unparalleled interoperability, seamless integration. Standard license for USD12.49 per month, limited to 50 participants per meeting. Pro license for USD17.49 per month, limited to 75 participants per meeting.\par
[9]\par
UberConference Share screen, voice intelligence, HD video meetings.\par
Up to 10 participants Uber Conference is free, but requires a PIN for each user. For 11-100 attendees, a subscription costs USD15 per month.\par
[24]\par
Mikogo Screen sharing feature, multi-user whiteboard and annotation tool.\par
USD14 per month, to be used only for 1:1 meetings. For meetings with up to 25 people, payment is USD16 monthly.\par
[19]\par
Vast Conference Conference Calling, worldwide Coverage, exceptional audio quality.\par
The Essentials, Standard, and Professional plans (for 10, 100, and 250 attendees) cost USD11.99, USD15.99, and USD31.99 per month.\par
[26] join.me Claim your own personalized URL, customize meeting back-ground, better audio, screen Sharing join.me's LITE, PRO, and BUSINESS plans are priced at USD10, USD20, and USD30 per month respectively.\par
[17] Intermedia Unite\par
Audio and video conferencing, file and screen sharing, and document management Contact with the sales team \hyperref[b13]{[16]} Being in a developing country so we have to think about the lowest cost with most facilities. Though it entirely depends on one's own choice but based on the Tables, we can say that Skype, Google Meet, UberConference, WebRoom, GoToMeeting, BrainCert are much suitable in the perspective of Bangladesh as well as all over the world. 
\section[{IX.}]{IX.} 
\section[{Conclusion}]{Conclusion}\par
In the activities of the online classroom, we can be benefited in many ways. It has broadened many fields of technology in online classrooms. It will save both our time and money. And the remaining can be invested in other mediums. It can also prepare us for the upcoming era of digitalization. It can help us to be familiar with technologies. Online classroom trends are forming like never before. These advanced classrooms are going to stay for a long time. It may happen that the traditional classrooms will be replaced by online ones. Technology is giving us so many things that cannot be counted. For instance, we are getting a new interactive education world for it as it is passing the physical and traditional boundaries. We should never stop learning. There is no limit to that also. Also, it is opening the new education door to the working people who work in the daytime. They can learn new things and enrich their knowledge through online classes. So we should be more familiar in Bangladesh to continue our education regularly whatever crisis like COVID-19 we face at any time. Through this paper, anyone can select their online learning platform as per their requirement. We have tried our best to put all the main features and costing details in a short format.\begin{figure}[htbp]
\noindent\textbf{12}\includegraphics[]{image-2.png}
\caption{\label{fig_0}Fig. 1 :Fig. 2 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{1} \par 
\begin{longtable}{P{0.5292452830188679\textwidth}P{0.3207547169811321\textwidth}}
Total Population\tabcellsep 167.2 million\\
Internet Users\tabcellsep 91.2 million\\
Active Social Media Users\tabcellsep 34 million\\
Mobile Connections\tabcellsep 157.2 million\\
Active Mobile Social Users\tabcellsep 32.2 million\end{longtable} \par
 
\caption{\label{tab_1}Table 1 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{2} \par 
\begin{longtable}{P{0.7524590163934426\textwidth}P{0.09754098360655737\textwidth}}
Description\tabcellsep Number\\
Total number of active internet users\tabcellsep 91.82million\\
\multicolumn{2}{l}{Internet Users as a percent of total population 55percent}\\
\multicolumn{2}{l}{Total number of active mobile internet users 86.42million}\\
Mobile Internet Users as a percent of total population\tabcellsep 52 percent\end{longtable} \par
 
\caption{\label{tab_2}Table 2 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{3} \par 
\begin{longtable}{P{0.6852713178294574\textwidth}P{0.16472868217054265\textwidth}}
Description\tabcellsep Number\\
Average Speed of Broadband Internet Connection\tabcellsep 9.06 MBPS\\
Internet Users as a percent of total population\tabcellsep 18.70 MBPS\end{longtable} \par
 
\caption{\label{tab_3}Table 3 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{4} \par 
\begin{longtable}{P{0.6942748091603054\textwidth}P{0.15572519083969466\textwidth}}
Description\tabcellsep Number\\
Total Number of Mobile Connection\tabcellsep 157.2 million\\
Mobile Connection as a\tabcellsep \\
percentage\tabcellsep 94 percent\\
of Mobile Connection\tabcellsep \\
Percentage of Prepaid Mobile Connection\tabcellsep 97 percent\\
Percentage of Postpaid Mobile Connection\tabcellsep 3 percent\\
Percentage of Broadband\tabcellsep \\
Mobile\tabcellsep \\
Connection\tabcellsep \end{longtable} \par
 
\caption{\label{tab_4}Table 4 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{5} \par 
\begin{longtable}{P{0.6053412462908012\textwidth}P{0.24465875370919882\textwidth}}
Total Population\tabcellsep 167.2million\\
Female Population percentage on whole\tabcellsep 49.6 percent\\
Male Population percentage on whole\tabcellsep 50.4 percent\\
\multicolumn{2}{l}{Annual Change in Population Size +1 percent}\\
Median Age\tabcellsep 27.5 years\\
Urban Population\tabcellsep 37 percent\\
GDP per Capita\tabcellsep 3869 dollar\\
Total Literacy Age(15+)\tabcellsep 73 percent\\
Female Literacy Age(15+)\tabcellsep 70 percent\\
Male Literacy Age(15+)\tabcellsep 76 percent\end{longtable} \par
 
\caption{\label{tab_5}Table 5 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{6} \par 
\begin{longtable}{}
\end{longtable} \par
 
\caption{\label{tab_6}TABLE 6 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{7} \par 
\begin{longtable}{P{0.06071428571428571\textwidth}P{0.4740384615384615\textwidth}P{0.29423076923076924\textwidth}P{0.021016483516483515\textwidth}}
Name\tabcellsep Features\tabcellsep Pricing\tabcellsep Source\\
GoToMeeting\tabcellsep Screen sharing, mobile conferencing, meeting recording and transcription, video and voice conferencing\tabcellsep Professional-pack Costs USD12 per participants. month for 150 participants, Business-pack costs USD16 per month for 250\tabcellsep {}[6]\\
\tabcellsep Free meeting room in the cloud,\tabcellsep \tabcellsep \\
Easymeeting\tabcellsep access to Easy meeting directory,\tabcellsep \tabcellsep \\
\tabcellsep available on Android and iOS.\tabcellsep \tabcellsep \end{longtable} \par
 
\caption{\label{tab_7}Table 7 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{8} \par 
\begin{longtable}{P{0.033801169590643276\textwidth}P{0.4145614035087719\textwidth}P{0.37976608187134503\textwidth}P{0.021871345029239767\textwidth}}
Name\tabcellsep Features\tabcellsep Pricing\tabcellsep Source\\
\tabcellsep Host audio and video meetings with up\tabcellsep \tabcellsep \\
ReadyTalk\tabcellsep to 125 attendees through desktops or mobile devices, customize participant profiles and assign roles for efficient\tabcellsep Standard and Premium Subscription cost USD12 and USD24 per month.\tabcellsep {}[20]\\
\tabcellsep meeting management.\tabcellsep \tabcellsep \\
\tabcellsep Share screen, remote control desktop,\tabcellsep Prices USD199 per year for 20\tabcellsep \\
Spreed\tabcellsep interactive whiteboard, recording and\tabcellsep persons and USD499 per year for\tabcellsep {}[23]\\
\tabcellsep archiving.\tabcellsep 100 persons.\tabcellsep \\
Vedamo\tabcellsep Online whiteboard, video conference, screen sharing, recording.\tabcellsep Unlimited video sessions for 25 month participants are priced at USD25 per\tabcellsep {}[27]\\
\tabcellsep \tabcellsep Basic costs Free for 2-100\tabcellsep \\
\tabcellsep Share-view desktop, collaborate in real\tabcellsep participants and the time is only for\tabcellsep \\
GOMEETNOW\tabcellsep time, record and playback, generate\tabcellsep 40 minutes. But the Pro version\tabcellsep {}[13]\\
\tabcellsep attendance reports\tabcellsep costs USD12.95 per month for 2-100\tabcellsep \\
\tabcellsep \tabcellsep participants with unlimited sessions\tabcellsep \end{longtable} \par
 
\caption{\label{tab_8}Table 8 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{9} \par 
\begin{longtable}{P{0.019250871080139374\textwidth}P{0.3188734030197445\textwidth}P{0.49904181184668983\textwidth}P{0.01283391405342625\textwidth}}
Name\tabcellsep Features\tabcellsep Pricing\tabcellsep Source\\
\tabcellsep \tabcellsep It offers three plans: Free, Pro and\tabcellsep \\
\tabcellsep \tabcellsep Enterprise. The free allows a\tabcellsep \\
\tabcellsep \tabcellsep maximum of 25 participants while the\tabcellsep \\
\tabcellsep Ability to save and share meeting files,\tabcellsep Pro costs between USD8-USD14\tabcellsep \\
Fuze\tabcellsep up to 1GB of cloud storage for all its\tabcellsep and hosts a maximum of 125\tabcellsep {}[12]\\
\tabcellsep plans\tabcellsep participants. The Enterprise comes\tabcellsep \\
\tabcellsep \tabcellsep with a monthly rate of over USD20\tabcellsep \\
\tabcellsep \tabcellsep and the maximum number of people\tabcellsep \\
\tabcellsep \tabcellsep can be discussed with the company\tabcellsep \\
\tabcellsep Supports HD audio and video calls,\tabcellsep Basic plan is free for holding\tabcellsep \\
\tabcellsep con-tent sharing with up to 1000\tabcellsep meetings with up to 100 people but it\tabcellsep \\
Zoom\tabcellsep meeting participants, synced end to\tabcellsep is limited to 40 minutes. Its pro plan\tabcellsep {}[30]\\
\tabcellsep end with your calendar via Outlook,\tabcellsep costs USD14.99 per host and has to\tabcellsep \\
\tabcellsep iCal, and Gmail\tabcellsep be paid monthly\tabcellsep \\
\tabcellsep \tabcellsep Starter edition costs USD19 per\tabcellsep \\
\tabcellsep \tabcellsep month if pay annually, and USD29 if\tabcellsep \\
\tabcellsep Video Audio Conferencing Services,\tabcellsep pay monthly. Pro edition costs USD29\tabcellsep \\
MegaMeeting\tabcellsep webinar hosting and web conferencing,\tabcellsep per month if pay annually, and\tabcellsep {}[18]\\
\tabcellsep screen and file sharing, recording\tabcellsep USD39 if pay monthly. Enterprise\tabcellsep \\
\tabcellsep \tabcellsep edition costs USD79 per month if pay\tabcellsep \\
\tabcellsep \tabcellsep annually, and USD99 if pay monthly\tabcellsep \\
Google Meet\tabcellsep Schedule meetings on the fly, lightweight app version runs smoothly on iOS and Android devices, integrated window access all of Google's apps from one with Google Calendar and Google Doc,\tabcellsep G Suite pricing starts as low as USD6 per user per month for Basic, USD12 Enterprise USD25 per user per month for per user per month for Business, and\tabcellsep {}[14]\\
\tabcellsep \tabcellsep Skype for Business is a free tool that\tabcellsep \\
\tabcellsep Audio and HD video calling, smart\tabcellsep can facilitate meetings with up to 250\tabcellsep \\
Skype\tabcellsep messaging, screen sharing, live subtitles, call recording, private\tabcellsep participants. It is integrated with MS Office apps and accessible via\tabcellsep {}[22]\\
\tabcellsep conversations\tabcellsep iPhone, Android, and PC/Mac\tabcellsep \\
\tabcellsep \tabcellsep devices\tabcellsep \end{longtable} \par
 
\caption{\label{tab_9}Table 9 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{10} \par 
\begin{longtable}{P{0.03055925432756325\textwidth}P{0.2241011984021305\textwidth}P{0.5794940079893476\textwidth}P{0.01584553928095872\textwidth}}
Name\tabcellsep Features\tabcellsep Pricing\tabcellsep Source\\
\tabcellsep \tabcellsep Costing for meeting and webinar\tabcellsep \\
\tabcellsep \tabcellsep differs. For meeting is prices USD10\tabcellsep \\
\tabcellsep \tabcellsep per month for monthly and USD8 per\tabcellsep \\
\tabcellsep \tabcellsep month for yearly payment both for 100\tabcellsep \\
Zoho Meeting\tabcellsep No download, screen sharing, audio-video, recording, secure session\tabcellsep participants. But in webinar it depends month on monthly payment and on persons. For in-stance it costs USD 19. USD 29, USD 39, USD 79 per\tabcellsep {}[29]\\
\tabcellsep \tabcellsep USD15, USD23, USD31, USD63 per\tabcellsep \\
\tabcellsep \tabcellsep month on annual payment on the\tabcellsep \\
\tabcellsep \tabcellsep basis of participants number 25, 50,\tabcellsep \\
\tabcellsep \tabcellsep 100, 150\tabcellsep \\
\tabcellsep Rich markup and annotation tools,\tabcellsep It has three packages named Easy,\tabcellsep \\
ELECTA LIVE\tabcellsep screen sharing and remote control, power points files and images, text-\tabcellsep Pro, Professional that cost USD29.90, USD39.90, USD69.90 per month with\tabcellsep {}[15]\\
\tabcellsep chat, session notes\tabcellsep 1, 1, 3 teacher rooms\tabcellsep \end{longtable} \par
 
\caption{\label{tab_10}Table 10 :}\end{figure}
 		 		\backmatter  			  				\begin{bibitemlist}{1}
\bibitem[Easymeeting (2020)]{b2}\label{b2} 	 		\textit{},  		 			Easymeeting 		.  		 \url{https://www.easymeeting.net}  		14 April 2020.  	 
\bibitem[Gotomeeting (2020)]{b3}\label{b3} 	 		\textit{},  		 			Gotomeeting 		.  		 \url{https://www.gotomeeting.com/en-in}  		April 2020.  	 
\bibitem[Proficonf (2020)]{b4}\label{b4} 	 		\textit{},  		 			Proficonf 		.  		 \url{https://www.proficonf.com}  		April 2020.  	 
\bibitem[ Adobe connect, Accessed (2020)]{b5}\label{b5} 	 		\textit{},  		 \url{https://buyconnect.adobe.com}  	 	 		\textit{Adobe connect, Accessed}  		April 2020. 15.  	 
\bibitem[Bluejeans (2020)]{b6}\label{b6} 	 		\textit{},  		 			Bluejeans 		.  		 \url{https://www.bluejeans.com}  		April 2020.  	 
\bibitem[Eztalks (2020)]{b8}\label{b8} 	 		\textit{},  		 			Eztalks 		.  		 \url{https://www.eztalks.com}  		April 2020.  	 
\bibitem[Intermedia (2020)]{b13}\label{b13} 	 		\textit{},  		 			Intermedia 		.  		 \url{https://www.intermedia.net}  		April 2020.  	 
\bibitem[Megameeting (2020)]{b15}\label{b15} 	 		\textit{},  		 			Megameeting 		.  		 \url{https://www.megameeting.com}  		April 2020.  	 
\bibitem[Pgi (2020)]{b17}\label{b17} 	 		\textit{},  		 			Pgi 		.  		 \url{https://www.pgi.com}  		April 2020.  	 
\bibitem[Skype (2020)]{b19}\label{b19} 	 		\textit{},  		 			Skype 		.  		 \url{https://www.skype.com/en}  		April 2020.  	 
\bibitem[Uberconference (2020)]{b20}\label{b20} 	 		\textit{},  		 			Uberconference 		.  		 \url{https://www.uberconference.com}  		April 2020.  	 
\bibitem[Webroom (2020)]{b21}\label{b21} 	 		\textit{},  		 			Webroom 		.  		 \url{https://webroom.net}  		April 2020.  	 
\bibitem[5 reasons why a virtual classroom better than a real one. dexway (2019)]{b24}\label{b24} 	 		\textit{5 reasons why a virtual classroom better than a real one. dexway},  		 \url{https://www.dexway.com/5-reasons-why-a-virtual-classroom-better-than-a-real-one}  		February 28, 2019.  	 
\bibitem[Braincert (2020)]{b7}\label{b7} 	 		\textit{Accessed 15},  		 			Braincert 		.  		 \url{https://www.braincert.com/elearning-platfor}  		April 2020.  	 
\bibitem[Fuze (2020)]{b9}\label{b9} 	 		\textit{Accessed 15},  		 			Fuze 		.  		 \url{https://www.fuze.com}  		April 2020.  	 
\bibitem[Gomeetnow (2020)]{b10}\label{b10} 	 		\textit{Accessed 15},  		 			Gomeetnow 		.  		 \url{http://www.gomeetnow.com/web-conferencing/index.html}  		April 2020.  	 
\bibitem[Cloud (2020)]{b11}\label{b11} 	 		\textit{Accessed 15},  		 			Google Cloud 		.  		 \url{https://gsuite.google.com/products/meet}  		April 2020.  	 
\bibitem[Accessed 15 (2020)]{b12}\label{b12} 	 		\textit{Accessed 15},  		 \url{https://www.e-lecta.com}  		April 2020.  	 
\bibitem[Mikogo (2020)]{b16}\label{b16} 	 		\textit{Accessed 15},  		 			Mikogo 		.  		 \url{https://www.mikogo.com}  		April 2020.  	 
\bibitem[Ringcentral (2020)]{b18}\label{b18} 	 		\textit{Accessed 15},  		 			Ringcentral 		.  		 \url{https://www.ringcentral.com}  		April 2020.  	 
\bibitem[Zoho (2020)]{b22}\label{b22} 	 		\textit{Accessed 15},  		 			Zoho 		.  		 \url{https://www.zoho.com}  		April 2020.  	 
\bibitem[Characteristics of a virtual classroom (2020)]{b25}\label{b25} 	 		\textit{Characteristics of a virtual classroom},  		 \url{https://www.learndash.com/characteristics-of-a-virtual-classroom}  		January 2020.  	 	 (Learn-Dash) 
\bibitem[Coronavirus disease (covid-19) -world health organization]{b0}\label{b0} 	 		\textit{Coronavirus disease (covid-19) -world health organization},  		 \url{https://www.who.int/emergencies/diseases/novel-coronavirus-2019}  		 	 
\bibitem[Asher]{b26}\label{b26} 	 		\textit{Definition -what is a virtual classroom? Learn Cube},  		 			Alex Asher 		.  		 \url{https://www.learncube.com/what-is-a-virtual-classroom.html}  		 	 
\bibitem[Digital in bangladesh 2019 report. Hype (2019)]{b23}\label{b23} 	 		 \url{https://hypedhaka.com/digital-data-bangladesh-2019/}  		\textit{Digital in bangladesh 2019 report. Hype},  				August 2019.  	 
\bibitem[Join me, Accessed 15 (2020)]{b14}\label{b14} 	 		\textit{Join me, Accessed 15},  		 \url{https://www.join.me}  		April 2020.  	 
\bibitem[What is a virtual classroom?-online learning solutions by raccoon gang]{b1}\label{b1} 	 		\textit{What is a virtual classroom?-online learning solutions by raccoon gang},  		 \url{https://raccoongang.com/blog/what-virtual-classroom/}  		 	 
\end{bibitemlist}
 			 		 	 
\end{document}
