Aircraft engines are complex machines designed to convert chemical energy stored in fuel into kinetic energy, providing the necessary thrust for atmospheric flight. The most common types operate by drawing in a large volume of air, which is then compressed, mixed with fuel, and ignited in a combustion chamber. The resulting high-pressure, high-temperature gas expands through a turbine and exhaust nozzle to generate propulsive force. Modern designs, such as turbofan engines, optimize efficiency by using large bypass airflows around the core engine, while others rely solely on the high-velocity exhaust of the core system. The operational efficiency of the engine is fundamentally dependent on the cycles of compression, combustion, and expansion, ensuring controlled expulsion of mass to generate measurable thrust.