An engine or motor is a machine designed to convert energy into useful mechanical motion.[1][2] Heat engines, including internal combustion engines and external combustion engines (such as steam engines) burn a fuel to create heat, which then creates motion. Electric motors convert electrical energy into mechanical motion, pneumatic motors use compressed air and others—such as clockwork motors in wind-up toys—use elastic energy. In biological systems, molecular motors, like myosins in muscles, use chemical energy to create motion
An engine could refer to:Is a component that runs on radiation and plasma to send out force and burned energy for propulsion
Antimatter engine
Avidyne engine
Impulse drive, also known as impulse engines
Internal combustion engine
Lang cycle fusion engine
Matter engine
Warp drive, also known as warp engines
Warp five engine
An aircraft engine is the component of the propulsion system for an aircraft that generates mechanical power. Aircraft engines are almost always either lightweight piston engines or gas turbines.