How did the gas motor by nikolaus otto work?

The gas motor also known as the four stroke internal combustion engine created by Nickolaus Otto was first used to generate power in a motorcycle and later on used in vehicles among other machinery. Power is generated from this engine through a cycle that consists of four steps. A mixture of air and fuel is introduced into an enclosed combustion chamber, this mixture is compressed and then ignited (thus causing an explosion)and then resulting exhaust gases are expelled from the combustion chamber. This reaction generates heat energy which is then converted into mechanical energy when the piston moves up and down. This motion is transferred to a crankshaft which powers a flywheel that maintains the rotary motion.

I'm pretty sure it's true