Tim Berners-Lee invented the World Wide Web in 1989. He proposed an information management system and implemented the first successful communication between an HTTP client and server via the Internet. The World Wide Web uses interlinked hypertext documents that are accessed using the HTTP protocol in a client-server architecture. HTML is used to define the structure and layout of a web page using tags, and CSS is used to style web pages. JavaScript and jQuery can be used to add interactive elements and effects to web pages.