Engine operation refers to the process by which an engine converts fuel into mechanical energy. In a typical internal combustion engine, fuel and air mix in the combustion chamber, where they are compressed by the piston. A spark from the spark plug ignites this mixture, causing a small explosion that pushes the piston down, creating power. This power is transferred to the crankshaft, which converts the linear motion of the pistons into rotational motion. The crankshaft then drives the vehicle's wheels, allowing it to move. Efficient engine operation relies on proper fuel combustion, lubrication, and cooling to maintain performance and longevity.