What is a Spark Plug? What does it do?

A spark plug is a device that delivers electric current from the ignition system to the combustion chamber. A spark from a spark plug is used to ignite the compressed air-fuel mixture in the combustion chamber. Initially, in the combustion chamber, the piston moves down to create a vacuum as to draw in the air-fuel mixture, the piston then moves up to compress this air-fuel mixture and the at the very last second a spark from the spark plug ignites this air-fuel mixture sending the piston down to the power cycle, the piston then moves up to get rid of the exhaust in the upward exhaust cycle.

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