The Genuine VW / Audi Ignition Coil Kit - 178388 is a comprehensive set of products designed for use in a car's ignition system. This kit includes multiple ignition coils, which are responsible for creating the spark that ignites the fuel in the engine. It also includes other necessary components such as spark plug wires, spark plugs, and possibly other small parts. This kit is specifically designed for use in Volkswagen and Audi vehicles, but can potentially be used in other makes and models as well. By providing all of the necessary components in one kit, this product makes it easy for car owners to replace and maintain their ignition system without having to purchase each individual part separately.