Why is a cars engine called an intern all combustion engine?

An internal combustion engine is a heat engine that operates by burning fuel inside a combustion chamber. The expansion of the hot gases created by combustion pushes a piston, which drives the crankshaft and generates power.

The term "internal" refers to the fact that the combustion takes place inside the engine, rather than in an external combustor such as a furnace. This design allows internal combustion engines to be much more compact and efficient than external combustion engines, making them ideal for use in vehicles.