Feedback control is a field of research that focuses on designing systems that automatically adjust and regulate their behavior based on an analysis of their own performance. This is done by continuously monitoring the output of a system and comparing it to a desired set point, and then making adjustments to the system's inputs to bring the output closer to the set point. Feedback control is used in a wide range of applications, including industrial processes, robotics, aircraft control systems, and even in the human body to regulate physiological processes. Researchers in this field work on developing algorithms, mathematical models, and control strategies to optimize the performance and stability of feedback control systems.