Your car’s engine basically runs on a series of miniature, contained explosions.
First, air and fuel are mixed in each cylinder.
When the piston rises toward the top of the cylinder, the spark plug fires.
Electricity arcs from the electrode to the tab, and the fuel and air mixture ignites.
This creates pressure as the fuel is transformed into a gas (emissions), which pushes the piston back down and turns the engine.
This cycle is repeated over and over again in each cylinder of your car.