The extension of hypertext into a combination of media, including image, animation, video, audio, hyperlinks, and other elements that intertwine into a non-linear document presentation in the form typical of contemporary Web documents.The World Wide Web (WWW) is a global hypermedia system linked through the public Internet. The terms hypertext and hypermedia are attributed to Ted Nelson, who, along with Douglas Englebart, developed the Hypertext Editing System in 1968. See also hyperlink, hypertext, and WWW.