The various types of CS:GO bans

There are 5 different type of bans in Counter-Strike Global Offensive. Here they are listed by their common name.
I) VAC bans: These are handed out for cheating and are permanent. For more information regarding VAC-bans go here.

II) Overwatch bans:
1.Minorly disruptive (griefing): Around 30 days/1 month.
2. Majorly disruptive (cheating -aim/wall/other external hacks): Permanent.
For more information regarding Overwatch-bans go here.

III) Account untrusted bans - These bans are permanent, 100% correct and won't be lifted. They will change into VAC ban over time.

IV) Competitive matchmaking bans
Competitive matchmaking cooldowns are handed out for leaving matches and not reconnecting in time (within 3 minutes).