A turbojet is a type of jet engine that generates thrust by expelling high-speed exhaust gases. It works by drawing in air, compressing it, mixing it with fuel, and igniting the mixture. The resulting hot gases expand and are expelled through a nozzle, propelling the aircraft forward. Turbojets are known for their simplicity and high-speed performance, making them suitable for military and commercial aircraft. While turbojets were widely used in early jet aircraft, they have largely been replaced by more efficient engines like turbofans. Turbojets are less fuel-efficient at lower speeds, which limits their use in modern aviation. However, they remain important in understanding the evolution of jet propulsion technology.