- An engine (or motor) is a machine designed to convert one or more forms of energy into mechanical energy
- A heat engine (מנוע חום, מנוע תרמי)
- converts heat energy into mechanical energy
- internal combustion engine (ICE or IC engine)
- the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit
- external combustion engine (EC engine) (מנוע בעירה חיצונית)
- steam engine (מנוע קיטור)
- rocket engine (מנוע רקטי)
- jet engine (מנוע סילון)
- radial engine (מנוע כוכבי)