Refer to figure.
An autogyro, also known as a gyrocopter or gyroplane, is a type of aircraft that uses a free-spinning rotor to generate lift, and a separate propulsion system to move forward through the air.

The autogyro's rotor is not powered, but instead relies on the airflow passing through it to generate lift (same as when a helicopter is in autorotation). The rotor is typically mounted on a mast above the fuselage, and consists of two or more blades that are shaped like airfoils. As the autogyro moves forward, air flows over the rotor blades and generates lift.

The autogyro also has a separate propulsion system, typically an engine and propeller, that provides thrust to move the aircraft forward through the air. The thrust from the engine-driven propeller provides the autogyro with forward motion, which in turn creates airflow over the rotor blades and generates lift.