Interactivity gives the audience the power to choose what ever he wants to see. Unlike an audio CD, the audience can only listen to music, and nothing but music. CD-I provides the audience with the options to browse, select information, scan it , use it, extract from it the data, instruction or entertainment desired. CD-I is a multimedium.
Multimedia means using a variety of different media in one production.
For instance, combining video pictures, music, animation, text and music to create a new medium is said to be multimedia. Once the contents of a film if formed, it cannot be changed. But multimedia acts like a library that allows the audience to take an image here, a bit of text there, a snatch of music and put them together in a way which fits the context in which they are used. Multimedia however allows them to be recombined into other desired form. Like any medium, CD-I has its limitation as to how much of different types of data it can store.