A distributor-less ignition system (DIS) is a type of ignition system used in internal combustion engines. Unlike traditional systems that use a distributor to send electrical signals to the spark plugs, DIS eliminates the distributor, allowing for more precise timing and improved engine performance. This system typically uses two ignition coils and can fire two spark plugs simultaneously, enhancing efficiency. DIS systems are commonly found in modern vehicles, as they reduce maintenance needs and improve reliability. By using electronic control units (ECUs) to manage ignition timing, DIS contributes to better fuel economy and lower emissions, making it a popular choice in contemporary automotive design.