World Wide Web, or WWW, is the most popular of Internet services, rapidly changing the way business is done around the world. The World Wide Web Consortium (W3C) defines the World Wide Web (WWW, or Web) as “the universe of network-accessible information, the embodiment of human knowledge.” The WWW began as a project for sharing hypertext information over a network that was developed by Tim Berners-Lee at CERN, a physics research center in Geneva, Switzerland.
The Web consists of all client and server applications that communicate over the Internet using the client/server protocol Hypertext Transfer Protocol (HTTP), as well as the resources that reside on those servers and are accessed by those clients.
These resources are generally referred to as “Web sites” and consist mainly of text files formatted in Hypertext Markup Language (HTML) and associated image, sound, multimedia, script, and other files.
Each HTML file is called a Web page (or page), and pages in a site are generally linked in a hierarchical fashion, starting with the home or top page, using anchor tags. Web sites are stored on Web servers, which run software that handles the server side of HTTP, such as Internet Information Services (IIS) for Microsoft Windows 2000.
Users access Web sites on the Internet by using client software, typically called a Web browser (such as Microsoft Internet Explorer).