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Ignition coils are an essential component in automotive engines, responsible for converting the battery's low voltage to thousands of volts needed to create an electric spark in the ignition system. They work in tandem with other components such as fuel pumps and distributors to ensure a smooth and efficient engine performance. Ignition coils are typically made up of a primary and secondary winding, separated by an insulating material, and a core made of iron or ferrite. When current flows through the primary winding, it creates a magnetic field that induces a high voltage in the secondary winding. This high voltage is then sent to the spark plugs, where it creates a spark that ignites the air-fuel mixture in the engine cylinder. Ignition coils can be found in various types and configurations, including standard coils, high-performance coils, and coil-on-plug designs. They are subject to wear and tear over time, especially in high-mileage vehicles, and may require replacement to maintain optimal engine performance.