WHAT DOES ABS SYSTEM MEAN AND HOW IT WORKS?

Anti-Lock Braking Systems 

system that allows the wheels on a car to maintain tractive contact with the road surface according to driver inputs while braking, preventing the wheels from locking up

it's easy to learn, you should check the internet

ACUALLY THIS IS TRUE BUT THE ANTI LOCK BRAK SYSTEM IT WORKING WITH THE AXELS CONECTED BY SENSORS EACH SENSOR GIVE READING WHEN THE CAR START TO MOVE AND ZERO REDING IF THE CAR IS STOP AND SOMETIMES ANY DAMAGE HAPPEND IN ABS PUMP OR MAJOUL IT MAKE MANY BRAKS PROBLEMS AND SOMETIMES TOO THE CAR LOSING THE POWER AS ATRANSMISSION PROBLEM

it's a anti locking braking system.it improves vahicle control  and decreases stopping distance..