What is the ignition coil for?

An ignition coil is a type of electrical transformer that creates a high-voltage electrical current needed to create an electric spark in spark-ignition internal combustion engines. It receives power from the car's battery and amplifies it to generate a sufficiently powerful voltage to ignite the air-fuel mixture in the cylinders. During engine operation, the ignition coil receives a low-voltage current from the ignition system, which is typically 12 volts in most cars. This low-voltage current is then converted into a high-voltage current of several thousand volts. This high-voltage current is then supplied to the spark plugs in the engine's combustion chambers, where it generates an electric spark that ignites the air-fuel mixture, creating the combustion that powers the engine.