What is the role of the piston in an engine?

The piston in an engine serves as a moving component that converts the energy generated from fuel combustion into mechanical work. It moves up and down within the cylinder, creating pressure changes that facilitate the intake of air-fuel mixture and the expulsion of exhaust gases. This linear motion of the piston is then transformed into rotational motion through the connecting rod and crankshaft, ultimately powering the vehicle or machinery.