good wiki
More at Wikipedia
Anti-lock braking system
An anti-lock braking system (ABS) is a safety feature in modern automobiles that prevents wheels from locking up during braking, thus maintaining traction with the road. This mechanism allows drivers to maintain steering control and maneuverability.
About
This mechanism allows drivers to maintain steering control and maneuverability. The ABS uses sensors to detect when a wheel is about to lock up and applies and releases the brakes rapidly to prevent this from happening. It is particularly effective in adverse driving conditions like wet or icy surfaces, where wheel lockup is more likely to occur. ABS has been widely adopted in vehicles around the world due to its significant contribution to road safety.