Ignition is the process of starting an engine. It involves three components: COMBUSTION, STARTER, and COIL. COMBUSTION is the process of burning fuel to create energy, which is necessary for the engine to run. The STARTER is a motor that is used to turn the engine over and get it running. Finally, the COIL is an electrical device that produces a high voltage spark to ignite the fuel-air mixture in the engine's cylinders. Together, these three components are responsible for the ignition of an engine.