A demo may refer to any of the following:
A software file that enables a user the ability to try a service, software program, software game, or software utility before purchasing it or signing up. Although demos are often available as demo disks, many demos today are downloaded from the Internet for free.
When referring to a game, demo mode refers to a mode that demonstrates the computer game without requiring any interaction from a human player.
Demo disk, Game terms, Software, Software terms, The Mother of All Demos
