The document provides definitions and explanations of key terms related to the World Wide Web and internet. It defines the World Wide Web as a system of interlinked hypertext documents accessed via the Internet. It was invented by Tim Berners-Lee in 1989. It also defines and describes other important related terms like web browsers, web pages, websites, web servers, HTTP, Internet, intranets, TCP/IP, URLs, and highlights some advantages and disadvantages of the Web.