Hypermedia: it is a superset of hypertext. Hypermedia documents comprise links not only to the other pieces of text, although also to other forms of media: sounds and images and movies. Images themselves can be chosen to connection to sounds or documents. It simply combines hypertext and multimedia.
Several examples of Hypermedia might be as:
Hypertext and HyperMedia both are principles, not products and both terms were coined through Ted Nelson.