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Showing content from https://developer.mozilla.org/en-US/docs/Glossary/World_Wide_Web below:

World Wide Web - MDN Web Docs Glossary: Definitions of Web-related terms

World Wide Web

The World Wide Webâcommonly referred to as WWW, W3, or the Webâis a system of interconnected public webpages accessible through the Internet. The Web is not the same as the Internet: the Web is one of many applications built on top of the Internet.

Tim Berners-Lee proposed the architecture of what became known as the World Wide Web. He created the first web server, web browser, and webpage on his computer at the CERN physics research lab in 1990. In 1991, he announced his creation on the alt.hypertext newsgroup, marking the moment the Web was first made public.

The system we know today as "the Web" consists of several components:

The HTTP protocol governs data transfer between a server and a client.
To access a Web component, a client supplies a unique universal identifier, called a URL (uniform resource locator) or URI (uniform resource identifier) (formally called Universal Document Identifier (UDI)).
HTML (hypertext markup language) is the most common format for publishing web documents.

Linking, or connecting resources through hyperlinks, is a defining concept of the Web, aiding its identity as a collection of connected documents.

Soon after inventing the Web, Tim Berners-Lee founded the W3C (World Wide Web Consortium) to standardize and develop the Web further. This consortium consists of core Web interest groups, such as web browser developers, government entities, researchers, and universities. Its mission includes education and outreach.