I am surprised by the general lack of ignorance about this subject shown on this site.
Basically ABS is a system as described that has sensors on the wheels to detects locked wheels. The ABS is linked to a pump that pulses the brakes to prevent full lockup, thereby maintaining steering control.
Since its introduction, various manufacturers have linked other systems to ABS to make cars safer. My Audi A2 for example has accelerometers and steering angle sensors as well as ABS wheel sensors. The car uses the ABS system to prevent wheel spin, ie ABS system is used to give traction control. It will also use the ABS system to prevent sideways drift and skidding. Technically this isn’t ABS, but the system is so integrated on modern cars that the ABS wheel sensors do more that provide straight forward ABS.
Bloody surprised you can drive for more than a couple of years and not use ABS. Also surprised how many on here clearly do not RTFM.