An engine is a machine that can convert other forms of energy into mechanical energy, such as internal combustion engines (gasoline engines, etc.), external combustion engines (Stirling engines, steam engines, etc.), electric motors, etc.
An internal combustion engine, for example, usually converts chemical energy into mechanical energy. The engine is suitable for both the power generator and the entire machine comprising the power unit (e.g. petrol engine, aeronautical engine). The engine was first born in the United Kingdom, so the concept of the engine also originated in English, its original meaning is the kind of "power-generating mechanical device".
