Regenerative brakes are like regular brakes, but they work in a different way. When you press on your car's brakes, the brakes use friction to slow the car down. With regenerative brakes, instead of slowing the car down using friction, the brakes use electricity generated by the car to stop the car. This electricity is stored in the car's battery and can be used later to power the car. So regenerative brakes can help save energy and make your car more efficient.