Automatic Call Distribution (ACD) is a telephony system that manages incoming calls and directs them to the appropriate agents or departments. It uses predefined rules to ensure that calls are routed efficiently, improving response times and customer satisfaction. ACD systems can handle high call volumes and are commonly used in call centers. ACD can also provide features like call queuing, where callers wait in line until an agent is available, and reporting tools that help analyze call patterns. This technology is essential for businesses that need to manage customer interactions effectively and maintain service quality.