An autogyro, also known as a gyroplane, gyrocopter or rotorcraft airplane, is a unique flying machine that uses a rotor to generate lift and a propeller for forward momentum. Some other synonyms for autogyro include gyroplane, gyrocraft and autogiro. These names all refer to the same type of aircraft, but the word autogyro is most commonly used. Autogyros have been around since the early 20th century and are popular for their simplicity, safety, and versatility. They are often used for aerial observation, search and rescue, and even recreational flying.