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 current to the spark plugs, DIS eliminates the distributor, allowing for more precise timing and improved engine performance. This system typically uses multiple ignition coils, one for each cylinder, which helps to reduce maintenance and increase reliability. In a DIS, the engine control unit (ECU) manages the timing of the spark for each cylinder. This setup enhances fuel efficiency and reduces emissions by ensuring that the spark occurs at the optimal moment. Overall, distributor-less ignition systems are a modern advancement in automotive technology, contributing to better engine management and performance.