Control system is one of the most challenging subjects in the engineering discipline, which usually requires complex calculations. This book is aimed to be a casual introduction to control theory for non-engineering students, especially in information technology (IT) and related fields. IT graduates are more and more critical to the control industry as the modern control systems are geared toward cloud-based real-time applications. Through the book, most complex calculations are replaced by the tools of MathWorks's Simulink and Simscape, which can beneficially make the readers focus on the theory of the control system and its adaptations. This book is supported by the MathWorks Book Program, which sponsors a license to MathWorks products to develop the materials.