This manoeuver is designed to teach you how to stop your car safely as quickly as possible. If a child runs out in front of your car, you don't want to be skidding and sliding all over the road.
This manoeuvre is one you'll use frequently as a driver. Reversing into a parking bay at a supermarket or in a car park is a key skill, and learning to do it right will spare you a lifetime of people making jokes about your driving.
