Anti-lock brakes (ABS) are a safety feature in vehicles designed to prevent the wheels from locking up during hard braking. When a driver applies the brakes suddenly, ABS automatically modulates the brake pressure, allowing the wheels to continue turning. This helps maintain steering control and reduces the risk of skidding. The system uses sensors to monitor the speed of each wheel. If it detects that a wheel is about to lock, it rapidly releases and reapplies the brake pressure. This process occurs several times per second, helping the driver maintain control and stop more safely in emergency situations.