An automobile engine is a machine that converts fuel into mechanical energy to power a vehicle. Most engines operate on the principle of internal combustion, where fuel and air mix and ignite within cylinders, creating small explosions that push pistons. These pistons turn the crankshaft, which ultimately drives the wheels of the car. There are various types of automobile engines, including gasoline engines, diesel engines, and electric motors. Gasoline engines are common in many cars, while diesel engines are often used in larger vehicles due to their efficiency. Electric motors are becoming increasingly popular as the automotive industry shifts towards more sustainable energy sources.