"Propeller-driven" refers to a type of aircraft or watercraft that uses a propeller as its primary means of propulsion. The propeller consists of blades that rotate around a central hub, creating thrust by pushing air or water backward. This movement propels the vehicle forward, making it a common choice for small planes, helicopters, and boats. In aviation, propeller-driven aircraft are often contrasted with jet-powered planes, which use jet engines for propulsion. Examples of propeller-driven aircraft include the Cessna 172 and the Piper Cub. These vehicles are typically more fuel-efficient at lower speeds and altitudes compared to their jet counterparts.