VAC refers to Valve Anti-Cheat, which is – as the name implies – an anti-cheat software developed
as part of the Steam platform, first released with Counter-Strike: Global Offensive (CS:GO) in 2002.
When the software detects any cheat on the player’s end, it will automatically disable it in the future,
possibly days or weeks after the detection.

As for the error message saying VAC was unable to verify the game session, this usually occurs due to
misconfigured files in your game, causing VAC to fail in verifying the source of the game. As a result,
you won’t be able to find a match until you fix this game error.

Steps to fix:-
Fix #01: Verify the integrity of your game files
1)Open the Steam client and click LIBRARY.
2)Find out and right-click Counter-Strike: Global Offensive, then select Properties.
3)Click the LOCAL FILES tab and choose to VERIFY THE INTEGRITY OF GAME FILES.
4)Wait for the process to complete, then exit Steam.

Fix #02: Clean Download Cache
1)Go to Steam Section
2)Click on the settings option
3)Go in the donwloads Tab
4)Click on clean download cache and restart your steam

Fix #3: Change name
1)Go and click on avatar
2)Click on open profile
3)Click on edit proflie
4)Change name and save

Credits:
Track: Frame — Dreams Are Pretty – Seoul June
Music provided by Audio Library

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PC Specs►
GPU: GTX 1050Ti
Processor: Pentium G4560
HDD: 500GB
Ram: 8GB
Internet Speed: 50Mbps Up & Down

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