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Tag Wiki 'Web Browser'.

A web browser (commonly referred to as a 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/URL) that may be a , image, video or other piece of content. present in resources enable users easily to navigate their to related resources.

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

The most popular web browsers are , (preceded by Internet Explorer), Safari, Opera and .

The first web browser was invented in 1990 by Sir . Berners-Lee is the director of the World Wide Web Consortium (W3C), which oversees the Web's continued development, and is also the founder of the World Wide Web Foundation. His browser was called and later renamed Nexus. In 1991 after the release of , developed the first cross-platform web browser, Line Mode Browser, which is credited for making the internet accessible to consumers for the first time.
(2017). 9780192862075, Oxford University Press.

The first commonly available web browser with a graphical user interface was . The development of Erwise was initiated by .

In 1993, browser software was further innovated by with the release of Mosaic, "the world's first popular browser", which made the World Wide Web system easy to use and more accessible to the average person. Andreesen's browser sparked the internet boom of the 1990s. The introduction of Mosaic in 1993 – one of the first graphical web browsers – led to an explosion in web use. Andreessen, the leader of the Mosaic team at National Center for Supercomputing Applications (NCSA), soon started his own company, named , and released the Mosaic-influenced Netscape Navigator in 1994, which quickly became the world's most popular browser, accounting for 90% of all web use at its peak (see usage share of web browsers).

responded with its Internet Explorer in 1995, also heavily influenced by Mosaic, initiating the industry's first . Bundled with Windows, Internet Explorer gained dominance in the web browser market; Internet Explorer usage share peaked at over 95% by 2002.

Opera debuted in 1996; it has never achieved widespread use, having less than 2% browser usage share as of February 2012 according to Net Applications. Its version has an additive share, in April 2011 amounting to 1.1% of overall browser use, but focused on the fast-growing mobile phone web browser market, being preinstalled on over 40 million phones. It is also available on several other , including 's video game console.

In 1998, Netscape launched what was to become the Mozilla Foundation in an attempt to produce a competitive browser using the software model. That browser would eventually evolve into , which developed a respectable following while still in the beta stage of development; shortly after the release of Firefox 1.0 in late 2004, Firefox (all versions) accounted for 7% of browser use. As of August 2011, Firefox has a 28% usage share.

Apple's Safari had its first beta release in January 2003; as of April 2011, it had a dominant share of Apple-based web browsing, accounting for just over 7% of the entire browser market.

The most recent major entrant to the browser market is , first released in September 2008. Chrome's take-up has increased significantly year by year, by doubling its usage share from 8% to 16% by August 2011. This increase seems largely to be at the expense of Internet Explorer, whose share has tended to decrease from month to month. In December 2011, Chrome overtook Internet Explorer 8 as the most widely used web browser but still had lower usage than all versions of Internet Explorer combined. Chrome's user-base continued to grow and in May 2012, Chrome's usage passed the usage of all versions of Internet Explorer combined. By April 2014, Chrome's usage had hit 45%.

Internet Explorer was deprecated in Windows 10, with replacing it as the default web browser.

Business models
The ways that web browser makers fund their development costs has changed over time. The first web browser, WorldWideWeb, was a research project.

In addition to being , Netscape Navigator and Opera were also sold commercially.

Internet Explorer, on the other hand, was bundled free with the Windows operating system (and was also downloadable free), and therefore it was funded partly by the sales of Windows to computer manufacturers and direct to users. Internet Explorer also used to be available for the Mac. It is likely that releasing IE for the Mac was part of Microsoft's overall strategy to fight threats to its quasi-monopoly platform dominance – threats such as web standards and Java – by making some web developers, or at least their managers, assume that there was "no need" to develop for anything other than Internet Explorer. In this respect, IE may have contributed to Windows and Microsoft applications sales in another way, through "lock-in" to Microsoft's browser.

In January 2009, the European Commission announced it would investigate the bundling of Internet Explorer with Windows operating systems from Microsoft, saying "Microsoft's tying of Internet Explorer to the Windows operating system harms competition between web browsers, undermines product innovation and ultimately reduces consumer choice." Microsoft Corp v Commission

Safari and Mobile Safari were likewise always included with macOS and iOS respectively, so, similarly, they were originally funded by sales of Apple computers and mobile devices, and formed part of the overall Apple experience to customers.

Some commercial web browsers are paid by search engine companies to make their engine default, or to include them as another option. For example, Yahoo! pays Mozilla, the maker of Firefox, to make Yahoo! Search the default search engine in Firefox. Mozilla makes enough money from this deal that it does not need to charge users for Firefox. By virtue of common ownership, , Internet Explorer, and Google Chrome default to their respective vendors' own search engines, Bing and , and may integrate with other platforms offered by the vendor. This encourages the use of their first-party services, which in turn, exposes users to advertising that can be used as a source of revenue.

Many less-well-known browsers, such as , were hardly funded at all and were developed mostly by volunteers free of charge.

[[File:Worldmap browsers.svg|thumb|Most used web browser by country, as of May 2012.

]] [[File:Browser Market Map June 2015.svg|thumb|Most used web browser by country, as of June 2015.

]] The primary purpose of a web browser is to bring information resources to the user ("retrieval" or "fetching"), allowing them to view the information ("display", "rendering"), and then access other information ("navigation", "following links").

This process begins when the user inputs a Uniform Resource Locator (URL), for example, into the browser. The prefix of the URL, the Uniform Resource Identifier or , determines how the URL will be interpreted. The most commonly used kind of URI starts with http: and identifies a resource to be retrieved over the Hypertext Transfer Protocol (HTTP). Many browsers also support a variety of other prefixes, such as https: for , ftp: for the File Transfer Protocol, and file: for . Prefixes that the web browser cannot directly handle are often handed off to another application entirely. For example, mailto: URIs are usually passed to the user's default e-mail application, and news: URIs are passed to the user's default newsgroup reader.

In the case of http, https, file, and others, once the resource has been retrieved the web browser will display it. and associated content (image files, formatting information such as CSS, etc.) is passed to the browser's to be transformed from to an interactive document, a process known as "rendering". Aside from HTML, web browsers can generally display any kind of content that can be part of a web page. Most browsers can display images, audio, video, and files, and often have plug-ins to support applications and . Upon encountering a file of an unsupported type or a file that is set up to be downloaded rather than displayed, the browser prompts the user to save the file to disk.

Information resources may contain to other information resources. Each link contains the URI of a resource to go to. When a link is clicked, the browser navigates to the resource indicated by the link's target URI, and the process of bringing content to the user begins again.

Market share

Available web browsers range in features from minimal, text-based user interfaces with bare-bones support for HTML to rich user interfaces supporting a wide variety of file formats and protocols. Browsers which include additional components to support e-mail, news, and Internet Relay Chat (IRC), are sometimes referred to as "" rather than merely "web browsers".

All major web browsers allow the user to open multiple information resources at the same time, either in different browser windows or in different tabs of the same window. Major browsers also include to prevent unwanted windows from "popping up" without the user's consent.

Most web browsers can display a list of web pages that the user has bookmarked so that the user can quickly return to them. Bookmarks are also called "Favorites" in Internet Explorer. In addition, all major web browsers have some form of built-in . In , web feeds are formatted as "live bookmarks" and behave like a folder of bookmarks corresponding to recent entries in the feed. In Opera, a more traditional feed reader is included which stores and displays the contents of the feed.

Furthermore, most browsers can be extended via plug-ins, downloadable components that provide additional features.

User interface
Most major web browsers have these user interface elements in common:
  • Back and forward buttons to go back to the previous resource and forward respectively.
  • A refresh or reload button to reload the current resource.
  • A stop button to cancel loading the resource. In some browsers, the stop button is merged with the reload button.
  • A home button to return to the user's .
  • An to input the Uniform Resource Identifier (URI) of the desired resource and display it.
  • A search bar to input terms into a web search engine. In some browsers, the search bar is merged with the address bar.
  • A to display progress in loading the resource and also the URI of links when the cursor hovers over them, and capability.
  • The viewport, the visible area of the webpage within the browser window.
  • The ability to view the source for a page.

Major browsers also possess features to search within a web page.

Privacy and security
Most browsers support and offer quick and easy ways to delete personally identifiable information such as the web cache, download history, form and search history, , and browsing history. For a comparison of the current security vulnerabilities of browsers, see comparison of web browsers.

Standards support
Early web browsers supported only a very simple version of HTML. The rapid development of proprietary web browsers led to the development of non-standard dialects of HTML, leading to problems with interoperability. Modern web browsers support a combination of standards-based and de facto HTML and , which should be rendered in the same way by all browsers.

A browser extension is a computer program that extends the functionality of a web browser. Every major web browser supports the development of browser extensions.

Web browsers consist of a user interface, layout engine, rendering engine, JavaScript interpreter, UI backend, networking component and data persistence component. These components achieve different functionalities of a web browser and together provide all capabilities of a web browser.

See also

External links

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