The rear axle is a component in a vehicle's suspension system that connects the wheels to the car's body. It consists of two half-shafts, which are connected by a differential and are located at either end of the vehicle. The purpose of the rear axle is to transmit power from the engine to the wheels while also allowing them to rotate freely when turning corners or making tight maneuvers. In addition, it helps in maintaining stability and preventing skidding during sudden stops or rapid changes in direction.