Multimedia is the communication of something in more than one way at the same time.
So for example, a CD can give you text, graphics, animation, video clips and sound. The key to learning is to maintain your interest by being active - active learning. The presentation of a CD should always be far more interactive than reading a book, if you can see how something is supposed to work instead of just reading about it you are likely to remember it more clearly. All the CDs in the library's collection are different and present information in a different way. There is no set format in their layout as different CDs are produced by different companies and Universities.