Used primarily in video games for unauthorized advantages, such as cheat codes, hacks, or exploits.
このゲームでチートを使うとアカウントが停止されることがある。
Using cheats in this game can get your account suspended.
If you use a cheat in that game, you get banned right away.
He couldn't defeat the boss without cheating.
友達がオンライン対戦でチートをしていて驚いた。
I was shocked that my friend was cheating in the online match.
The operator's investigation found the cheat, and the player was permanently banned.
This new equipment is cheat-level strong.
カンニング means cheating specifically on exams or tests, while チート refers to cheating in video games such as using hacks or exploits.
Borrowed from English 'cheat', used in Japanese primarily in gaming contexts.