In modern era, a control system plays a vital role in human life. A control system is an interconnection of components forming a system configuration in which quantity of interest is maintained or altered in accordance with a desired manner. This book covers various aspects of control systems like reduction techniques of multiple systems, time response analysis of the three orders of control systems and steady state error of different systems. While delving into the finer details of the subject, the book explains different components of control system like actuators, sensors, etc. As the learners progress with these components, the book explains the stability of control system which affects its performance of control system. The root locus techniques of different systems and their frequency response analysis has been explained in a simple manner. The book has also dealt with stability in frequency domain, review of state variable techniques and also introduces design to the learner. This book is designed for undergraduate engineering students of different branches in the field of control system. This book strictly follows the syllabus of various universities without sacrificing the basic principles and depth of the subject.