<human>:  How does a car engine work?
<bot>: A car engine is an internal combustion engine which uses the energy released from burning gasoline to power the vehicle. The engine is made up of a complex network of parts that work together to turn the chemical energy from gas into mechanical power. The engine utilizes four key steps to convert the fuel into the mechanical energy: air intake, compression, combustion, and exhaust. In the air intake phase, the engine takes in a mix of fuel and oxygen from the atmosphere. The compression phase then increases the pressure and temperature of the air-fuel mixture. During combustion, the high-pressure mixture is ignited by the spark plug, causing a sudden increase of pressure and temperature, which forces the piston downward. Finally, the exhaust phase removes the burnt gases from the engine.