The book Digital Fundamentals and Applications has been written by utilizing the long experience of the authors in teaching profession. This book is divided into thirteen chapters. Each chapter begins with the introduction and ends with review questions. Clear diagrams and different graded examples have been provided for all the topics and simple language has been used throughout the book to facilitate understanding of the concept and enable the readers to design digital circuits efficiently. This book can be used by UG Students of any engineering colleges and universities, and those who will be appearing for different competitive examination such as GATE, AMIE, IAS, IES, different state and central level recruitment examination, UPSC, PSC, Railway Board, etc. Salient features of the book are as follows: The subject has been presented in the graded manner and contents a detailed exposition of the fundamentals. Description of the classical methods of design technique. Clearly illustrated worked out example. Step-by-step and simple problem solving technique enable the students to sharpen their problem solving skills.