What part of an engine delivers electricity to the ignition?

A spark plug is an electrical device used in an internal combustion engine to produce a spark that ignites the air-fuel mixture in the combustion chamber. As part of the engine's ignition system, the spark plug receives high-voltage electricity (generated by an ignition coil in modern engines and transmitted via a spark plug wire) which it uses to generate a spark in the small gap between the positive and negative electrodes.

Source: Wikipedia