Automatic Call Distribution (ACD) is a telephony system that manages incoming calls and directs them to the appropriate agents or departments. It uses pre-defined rules to ensure that calls are routed efficiently, reducing wait times for callers and improving overall service quality. ACD systems can prioritize calls based on various factors, such as caller needs or agent availability. This technology is commonly used in call centers to enhance customer experience and streamline operations, allowing businesses to handle a high volume of calls effectively.