What is the function of anti-lock braking system?

Is the ABS system. The car braked to the end, the wheels locked, and the wheels "dragged" on the ground, and the direction was out of control.

ABS system is used to prevent this phenomenon. When the wheel lock is detected, the brake will be released automatically and the wheel will roll. Then brake automatically, and then release automatically. This "loosens the brake" and imitates the action of quick braking.