<human>:  How does an internal combustion engine work?
<bot>: An internal combustion engine works by taking in air and fuel, compressing it, and then igniting the mixture by a spark plug. This process causes an explosion which drives the pistons, thus producing a rotational motion that powers the vehicle. The exhaust gases are then released, usually through an exhaust manifold. In order for the engine to work efficiently and generate more power, it needs to be properly maintained and the fuel needs to be of the proper quality.