Jet propulsion is a method of moving an object by expelling gas at high speed in the opposite direction. This principle is based on Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In jet engines, air is compressed, mixed with fuel, and ignited, producing a high-speed exhaust that propels the engine forward. Commonly used in aircraft, such as commercial jets and military fighter planes, jet propulsion allows for rapid travel over long distances. It is also utilized in rockets, which operate in space where there is no air, relying solely on the expulsion of gas to generate thrust.