Rack and Pinion Steering is a common type of steering mechanism used in many vehicles. It consists of a round gear called a pinion that meshes with a flat bar known as a rack. When the driver turns the steering wheel, the pinion rotates, moving the rack side to side, which in turn steers the vehicle's wheels. This system is popular because it provides precise control and a direct connection between the steering wheel and the wheels. It is also relatively simple and compact, making it suitable for various vehicle designs, from cars to trucks.