This book is designed for BE|BTech|BSc|MSc students of all Indian universities. An easy to understand text with crisp but complete explanations of topics will enable the students to understand the basic concepts easily. This book is organized with 15 chapters. The fundamental concepts, analysis, and design of digital logic circuits and systems are presented in a simple and elaborative manner. Throughout the book, carefully chosen examples are supplemented with illustrative diagrams so that the reader will clearly understand the concepts discussed.