Control theory is a branch of mathematics that deals with how to control a system. Control theory in robotics deals with the design of controllers for robots. A controller is the part of the system that receives external input and generates an output signal. The main idea of using control theory is to find a way to achieve a predefined goal for a system.Control system block diagramFor example, let us say we are using a robot arm to open a door by applying pressure on the handle. We want to en...