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Web Browser
A Web browser is a software application for retrieving, presenting, and traversing information resources on the World Wide Web. An information resource is identified by a Uniform Resource Identifier (URI) and may be a web page, image, video, or other piece of content. Hyperlinks present in resources enable users to easily navigate their browsers to related resources.

Although browsers are primarily intended to access the World Wide Web, they can also be used to access information provided by Web servers in private networks or files in file systems.

The major web browsers for Windows are
  1. Windows Internet Explorer
  2. Mozilla Firefox
  3. Google Chrome
  4. Opera
  5. Apple Safari

The major web browsers for Macintosh systems are
  1. Mozilla Firefox
  2. Apple Safari
  3. Opera
Windows Internet Explorer
Windows Internet Explorer (formerly Microsoft Internet Explorer), is a series of graphical web browsers developed by Microsoft and included as part of the Microsoft Windows line of operating systems starting in 1995. It has been the most widely used web browser since 1999, attaining a peak of about 95% usage share during 2002 and 2003 with IE5 and IE6.

Mozilla Firefox
Mozilla Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. A Net Applications survey put Firefox at 24.07% of the recorded usage share of web browsers as of October 2009, making it the second most popular browser in terms of current use worldwide after Microsoft's Internet Explorer. To display web pages, Firefox uses the Gecko layout engine, which implements most current web standards in addition to several features which are intended to anticipate likely additions to the standards.

Latest Firefox features include tabbed browsing, spell checking, incremental find, live bookmarking, a download manager, private browsing, location-aware browsing (aka "geolocation") based exclusively on a Google service and an integrated search system that uses Google by default in most localizations. Functions can be added through add-ons, created by third-party developers, of which there is a wide selection, a feature that has attracted many of Firefox's users.

Apple Safari
Safari is a web browser developed by Apple Inc. First released as a public beta on 7 January 2003 on the company's Mac OS X operating system, it became Apple's default browser beginning with Mac OS X v10.3 "Panther". Apple has also made Safari the native browser for the iPhone OS. A version of Safari for the Microsoft Windows operating system first released on June 11, 2007 supports Windows XP, Windows Vista, and Windows 7. The current stable release of the browser is 4.0.3 for Mac OS X and Windows. Safari had a 4.24% market share in September 2009.

Opera
Opera is a Web browser and Internet suite developed by the Opera Software company. The browser handles common Internet-related tasks such as displaying Web sites, sending and receiving e-mail messages, managing contacts, IRC online chatting, downloading files via BitTorrent, and reading Web feeds. Opera is offered free of charge for personal computers and mobile phones. Features of Opera include tabbed browsing, page zooming, mouse gestures, and an integrated download manager. Its security features include built-in phishing and malware protection, strong encryption when browsing secure Web sites, and the ability to easily delete private data such as HTTP cookies.

Google Chrome
Google Chrome is a web browser released by Google which uses the WebKit layout engine and application framework. It was first released as a beta version for Microsoft Windows on 2 September 2008, and the public stable release was on 11 December 2008. The name is derived from the graphical user interface frame, or "chrome", of web browsers. As of 1 November 2009, Chrome was the fourth most widely used browser, with 3.58% of worldwide usage share of web browsers. Development versions of Chrome for Linux and Mac OS X were released in June 2009.

Google released the entire source code of Chrome, including its bespoke V8 JavaScript engine as an open source project entitled Chromium, in 2008. This move enabled third-party developers to study the underlying source code and potentially port the browser to the Linux and Mac OS X platforms. A Google spokesperson also expressed hope that other browsers would adopt V8 to help web applications. The Google-authored portion of Chromium is released under the permissive BSD license, which allows portions to be incorporated into both open source and proprietary software programs. Other portions of the source code are subject to a variety of different open-source licenses. Chromium implements the same feature set as Chrome, but has a slightly different logo.