A jet engine is a type of engine that propels aircraft by producing thrust through the expulsion of high-speed exhaust gases. It operates on the principle of Newton's Third Law, which states that for every action, there is an equal and opposite reaction. Jet engines typically intake air, compress it, mix it with fuel, and ignite the mixture to create a powerful exhaust that pushes the aircraft forward. There are several types of jet engines, including turbojets, turbofans, and turboprops. Each type has its own design and efficiency characteristics, making them suitable for different types of aircraft and flight conditions. Jet engines are essential for modern aviation, enabling commercial and military aircraft to travel long distances at high speeds.