Hypertext is text displayed on a computer with references (hyperlinks) to other text that the reader can immediately access, usually by a mouse click or keypress sequence. Apart from running text, hypertext may contain tables, images and other presentational devices. Other means of interaction may also be present, such as a bubble with text appearing when the mouse hovers over a particular area, a video clip starting, or a form to complete and submit. The most extensive example of hypertext today is the World Wide Web.

http://en.wikipedia.org/wiki/Hypertext.