A turbofan is a type of jet engine commonly used in commercial aircraft. It consists of a large fan at the front, which draws in air, and a series of compressors and turbines that help generate thrust. The engine operates by mixing air with fuel and igniting it, producing high-speed exhaust that propels the aircraft forward. Turbofans are known for their efficiency and quieter operation compared to traditional turbojet engines. They are designed to provide a significant amount of thrust while minimizing fuel consumption, making them ideal for long-distance flights in modern airliners.