Sound stored on a computer is digital .
Natural sound is the result of a stream of continuous changes of vibrations in the atmosphere.
The process of converting natural analog sound into discrete digital sound is digitization . Resources Download the RealPlayer from Real Networks and install it in your Web browser plugins. There is a freeware and commercial version available. Many CD audio file formats exist and information about them can be found on the net. For those students who are interested analog audio information can also be located on the net.