Control theory is the study of how to influence the behavior of dynamic systems using feedback, models, and control signals. It is relevant to robotics, automation, engineering, and AI systems that act in changing environments.
In control systems engineering is a subfield of mathematics that deals with the control of continuously operating dynamical systems in engineered processes and machines. The objective is to develop a control model for controlling such systems using a control action in an optimum manner without delay or overshoot and ensuring control stability.