Here is what users have to say about Web Applications
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POV: date=July 2008

Web applications are popular due to the ubiquity of a client, sometimes called a thin client. The ability to update and maintain web applications without distributing and installing software on potentially thousands of client computers is a key reason for their popularity. Common web applications include webmail, online retail sales, online auctions, wikis, massively multiplayer online role-playing games and many other functions.
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POV: date=July 2008

Web applications are popular due to the ubiquity of a client, sometimes called a thin client. The ability to update and maintain web applications without distributing and installing software on potentially thousands of client computers is a key reason for their popularity. Common web applications include webmail, online retail sales, online auctions, wikis, massively multiplayer online role-playing games and many other functions.
History
In earlier types of client-server computing, each application had its own client program which served as its user interface and had to be separately installed on each user's personal computer. An upgrade to the server part of the application would typically require an upgrade to the clients installed on each user workstation, adding to the support cost and decreasing productivity.
In contrast, web applications use web documents written in a standard format such as HTML (and more recently XHTML), which are supported by a variety of web browsers.
Generally, each individual web page is delivered to the client as a static document, but the sequence of pages can provide an interactive experience, as user input is returned through web form elements embedded in the page markup. During the session, the web browser interprets and displays the pages, and acts as the universal client for any web application.
In 1995, Netscape introduced a client-side scripting called JavaScript, which allowed programmers to add some dynamic elements to the user interface that ran on the client side. Until then, all the data had to be sent to the server for processing, and the results were delivered through static HTML pages sent back to the client.
In 1996, Macromedia introduced Flash, a vector animation player that could be added to browsers as a plugin to embed animations on the web pages. It allowed the use of a scripting language to program interactions on the client side with no need to communicate with the server.
In 1999, the "web application" concept was introduced in the Java language in the Servlet Specification version 2.2. 1. At that time both JavaScript and XML had already been developed, but AJAX had not still been coined and the XMLHttpRequest object had only been recently introduced on Internet Explorer 5 as an ActiveX object.
In 2004, Web 2.0 was coined, and it was proposed to use the Web as a platform, as opposed to simply developing applications that used Internet to communicate with the server.
In 2005, AJAX was coined, and applications like Gmail started to make their client sides more and more interactive.
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