A closed-loop control system is a type of control mechanism that uses feedback to ensure the desired output is achieved. It continuously monitors the output and compares it to a set reference or target value. If there is a difference, the system makes adjustments to minimize this error, ensuring that the output remains stable and accurate. These systems are commonly used in various applications, such as thermostats for temperature control and automated manufacturing processes. By incorporating feedback, closed-loop systems can adapt to changes and disturbances, making them more reliable and efficient than open-loop systems, which do not use feedback.