"Digital Electronics" is a very fundamental course for Electrical, Electronics and Computer Science Engineering. Most of the electronics systems are moving from analog to digital because of few significant advantages. And day by day the complexity level of digital systems is growing high. Digital Electronics is an important subject, common for Computer, Electrical, Electronics, and Instrumentation Engineering students. It deals with the theory and practical knowledge of Digital Systems and how they are implemented in various digital instruments. This makes very much important to learn the basic fundamentals of Digital Electronics for a ECE or CSE Engineer.