This topic is covered better by other wikis or sites. Please see the following links instead:
- Valve Anti-Cheat on Wikipedia;
- Valve Anti-Cheat on the Valve Developer Community wiki;
- Valve Anti-Cheat System on the Steam Support Center.
Valve Anti-Cheat, abbreviated as VAC, is an anti-cheat solution developed by Valve Corporation as a component of the Steam game development platform.