Motorcycles are two-wheeled vehicles similar to other forms of transportation but with fewer protective features than cars. They typically have one or two cylinders, making them more fuel efficient and affordable than other vehicles. Unlike cars, motorcycles use air rather than water for engine cooling and have fins on the exterior to help keep cylinders cool. They are operated using a clutch and foot pedals to shift gears and brake, rather than hand brakes, and provide a cheaper and more compact transportation alternative for those without families or who enjoy the outdoors.