A Rotary Engine is a type of internal combustion engine that uses a triangular rotor instead of traditional pistons. This rotor moves in an eccentric motion within a housing, creating chambers that compress and ignite fuel. The design allows for a smoother operation and fewer moving parts, which can lead to a lighter engine. One of the most well-known examples of a rotary engine is the Wankel Engine, named after its inventor, Felix Wankel. Rotary engines are often praised for their compact size and high power-to-weight ratio, making them popular in certain applications like sports cars and aircraft.