Direct Digital Control (DDC) is a form of automated control used in many industrial and commercial applications. It is a type of closed-loop control system that uses digital signals to control and monitor the behavior of a process or system. It is a type of feedback control system that uses digital logic to control and monitor the behavior of a process or system. DDC systems are used to control and monitor a wide variety of processes, including temperature, pressure, flow, and other variables. DDC systems are typically used in HVAC systems, but can also be used in industrial and commercial applications. DDC systems are designed to provide accurate and reliable control of a process or system, and are often used in conjunction with other control systems such as programmable logic controllers (PLCs). DDC systems can be used to automate processes, reduce costs, and improve efficiency. DDC systems are typically designed to be user-friendly and can be easily integrated into existing systems. DDC systems are often used in conjunction with other control systems such as programmable logic controllers (PLCs) to provide a more comprehensive control system.