The four cycles of a four-stroke engine, commonly found in all cars.
Piston on the way down sucks int he air and fuel mixture. On the way up the piston then compresses this mixture.
Once piston reaches it furthermost top position the spark plug ignites the mixture. This leads to an explosion pushing the piston back down.
When the piston comes for the second time up it pushes the exhaust gases out and then begins its descent and thus a new cycle.
The piston is connected via a connection-rod (con-rod) to the crankshaft. The latter powers the gearbox which in turn via a differential powers the wheels of the car.
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