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What is a Web browser ?

A web browser is a software application that enables a user to display and interact
 with text, images, videos, music and other information typically located on a Web page
 at a website on the World Wide Web or a local area network.
 Important web browsers:
 • Mosaic, April 22,1993
 • Netscape Navigator and Netscape Communicators, October 13, 1994
 • Internet Explorer, August 1995
 • Opera,1996
 • Mozilla Firefox, 2004
 The most popular browser is Internet Explorer and is published by Microsoft and the
 second most popular browser is Netscape (or Netscape Navigator). It is also freely
 available.
 Under the title bar, a browser displays its main menu.

The Toolbar: 

Under the main menu, a browser is equipped with small pictures called
 buttons. Microsoft Internet Explorer usually displays these buttons on their own range
 (called a toolbar).

The Address bar :

the space where the address of a particular website is to be typed to view the site.