A feedback control system is a mechanism that automatically adjusts its output based on the difference between the desired and actual performance. It continuously monitors the system's output and compares it to a set target, known as the reference value. If there is a discrepancy, the system makes corrections to minimize the error, ensuring that the output remains close to the desired level. These systems are widely used in various applications, such as automobiles, temperature control, and industrial processes. By employing sensors and controllers, feedback control systems enhance stability and accuracy, making them essential in modern technology and engineering.