A scooter is a motorcycle with an underbone or step-through frame, a seat, and a platform for the rider's feet, emphasizing comfort and fuel economy. What is unique about scooters is the fact that the engine is usually under the seat and directly attached to the rear axle. This allows the rider to not have to straddle the engine but puts a limitation on rear suspension quality. Typically scooters feature lower displacement, automatic engines and have bodywork to conceal all the mechanicals.