Propeller engines, also known as propeller-driven engines, are a type of aircraft engine that uses a rotating blade, or propeller, to generate thrust. These engines can be either piston engines or turboprop engines, where the latter combines a gas turbine with a propeller. The spinning propeller creates a difference in air pressure, pulling the aircraft forward. Propeller engines are commonly found in smaller aircraft, such as Cessna and Piper planes, as well as in some regional airliners. They are known for their efficiency at lower speeds and altitudes, making them ideal for short-haul flights and general aviation.