What is oversteer-watch this video to find out

Why is the car oversteer? And why is the car turning on a slippery road? I'll try to explain in simple words.
We unexpectedly drove through the pit. Still, it's normal, just a little shaken. The front wheels of the car received a stronger impact than the rear.

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finally I understand about oversteer and what to do. thanks. hope never happen in my life.