What WikiWikiWeb is. -- JeffBay
A term invented by TedNelson for an idea first proposed by VannevarBush.
What is it? Well, you're looking at it so you must have some idea. However, in this paper http://www.e-drexler.com/d/06/00/Hypertext/HPEK0.html by EricDrexler, there is a fuller discussion of the taxonomy of HyperTexts. See also HyTime, and the history section at http://www.w3.org/.