What is the purpose of the Audi A80's anti-lock braking system (ABS)?

I've noticed a button for the ABS on my Audi 80's dashboard, but I'm not sure when I should use it or why it's important. Can someone explain the purpose of this feature and when I should activate it while driving?

The purpose of the ABS in your Audi 80 is to prevent your wheels from locking up during hard braking, allowing you to maintain steering control and avoid skidding. It's an important safety feature that should be activated whenever you need to make a sudden stop.