An ignition coil is a crucial component in a vehicle's ignition system. Its main job is to convert the low voltage from the battery into a high voltage that is needed to create a spark in the spark plugs. This spark ignites the air-fuel mixture in the engine's cylinders, allowing the engine to run smoothly. When the ignition coil fails, the engine may misfire or not start at all. Regular maintenance can help ensure that the ignition coil and other parts of the ignition system, like the distributor and spark plugs, are functioning properly, leading to better performance and fuel efficiency.