Known originally as the ARPAnet, the original network of four computers has grown exponentially to include millions of computers at virtually every major university, corporations, and government agency. WWW can be thought of as a very large subset of the Internet, consisting of hypertext and hypermedia documents. A hypertext document contains a link to another document. Links are keywords, phrases, or pictures in a Web page that when clicked using a mouse will connect you to related information. They are highlighted in a special color and underlined .
Hypermedia provides links to graphic, sound, and video files in addition to text files.
HTML is a formatting language that tells the browser to to display text and images. It allows the full use of hypermedia including text, image, graphics, sounds, and other types of multimedia. It uses a set of special instructions called tags to define the characteristics of items. In order for each client to display every document from every server, a set of standards known as a protocol is necessary to govern the way data is transmitted across the Web. Data travels from client to server and back through a protocol known as the HyperText Transfer Protocol.