An ignition coil is an essential component in a vehicle's ignition system. Its primary function is to convert the low voltage from the battery into a high voltage needed to create a spark in the engine's spark plugs. This spark ignites the air-fuel mixture in the engine's cylinders, enabling the engine to run. Typically, an ignition coil consists of two wire coils wrapped around a magnetic core. When electricity flows through the primary coil, it generates a magnetic field. This field induces a high voltage in the secondary coil, which is then sent to the spark plugs, ensuring efficient engine performance.