This book is a compilation of chapters that discuss the most vital concepts in the field of circuits and systems. It discusses the various technologies that have been developed in this field of study. Circuits and systems provide networks and channels for movement of electrical energy, signals and data and information as well as provide connection between disparate electrical components. Selected concepts that redefine this area of circuits and systems have been presented in this text. It explores all the important aspects of the field in the present day scenario. This textbook aims to serve as a resource guide for students and facilitate the study of the discipline.