Linear media describes media with a defined beginning and a linear
progression to the end. Forms of linear media such as film, audio and
videotape, as well as most books are organized with this expectation. The
World Wide Web, however, is organized differently.
Hypermedia is about choice. Users simply select what interests them. A
good example is an audio CD where you can choose song 5 and listen to
it almost immediately. Contrast this with an audiotape where you would
have to scan through from your current location on the tape to the
beginning of the song....