Demo disk
A physical disk or CD used to help demonstrate a service, software program, software utility, or software game. Demo disks offer a free or cheap way for a user to try a program before buying it or signing up. Today, demo disks and demo discs have largely been replaced by downloadable demos from the Internet.
A demo disk may also refer to a diskette or disc that has multiple demos on it. For example, many computer magazines send demo disks packed full of demos on them. These disks can be very nice as they allow a user not to have to download several hundred megabytes of demos from the Internet.
Also see: Demo