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WWW - technical definition

World Wide Web. Also known as w 3 and the Web. A global interlinked hypertext system that uses the Internet infrastructure to network client workstations and servers all around the world based on the Hypertext Transport Protocol (HTTP). Documents on the WWW -- known as pages, home pages, or Web pages -- are written in Hypertext Markup Language (HTML), are identified by Uniform Resource Locators (URLs), and are transmitted over the Internet through the use of HTTP.The WWW also incorporates hypermedia, which is hyperlinked multimedia, including not only text, but also audio, graphics, animations, and video.Tim Berners-Lee developed the WWW at l'Conseil Europ

See WWW in Computer

(World Wide Web) The common host name for a Web server. The "www-dot" prefix on Web addresses is widely used to provide a recognizable way of identifying a Web site. Computers read Web addresses (URLs) from right to left, so that the WWW is the last component of the address.

WWW Is Optional
Today, the WWW prefix is mostly optional, and it is common to advertise only the domain name such as computerlanguage.com without the WWW. Web sites are typically configured to default to a WWW Web server if only the domain name is used. Try it. Type the name of a Web site into your browser using only the domain name, such as computerlanguage.com. See dub-dub-dub, World Wide Web, DNS and URL.

WWW2, WWW3, etc.
Organizations use WWW2, WWW3 and other similar prefixes as a way of identifying additional Web sites or Web content. This is strictly an arbitrary naming that differentiates their own sites from the ones that use the WWW prefix, which has become a default. The names have no connection to "Internet 2" or other global systems or standards.