Jet propulsion is a method of generating thrust by expelling a jet of fluid, typically air or exhaust gases, at high speed. This principle is widely used in aircraft and spacecraft, allowing them to achieve flight and maneuverability. The basic concept relies on Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In jet engines, fuel is burned to produce hot gases that are expelled through a nozzle, creating thrust. This technology has revolutionized air travel, enabling faster and more efficient transportation. Notable examples include the Turbojet and Turbofan engines, which power many modern aircraft.