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Valve Anti-Cheat (VAC) is an anti-cheat component of the Steam platform, and it is used to protect against in-game cheating in a variety of games. Any modification to a game which allows for one player to have an advantage over another player may be considered a cheat. The VAC system detects cheats using cheat signatures, and should a cheat be detected by VAC the offending player will receive a VAC ban.

A VAC ban is not to be confused with a server side specific ban. If you receive the notification message "STEAMID IS BANNED" when attempting to join a game-server then you have received a server side specific ban. The server administration team for the server in question have decided to prohibit you from joining their server, but you have not received a VAC ban and as a result you may continue to partake on other game-servers. VAC is an automated system and server administrators may not impose a VAC ban.