Digital Electronics is essential to understanding the design and working of wide range of applications, from consumer and industrial electronics and Communication, From Embedded system and computers to security and military equipments. The device is in this application decrease in size and more complex in technology it is essentially for the readers to understand the fundamentals and increase the fundamental and implements the application in digital electronics.This book consist of five chapter, where the Chapter-1 consist of fundamental towards digital Electronics, comparison between different types of signals .Chapter -2 consist of number system, different examples of conversion of number system. Chapter -3 consist of combinational logic circuit, Boolean algebra with various solutions. Chapter - 4 consist of sequential logic circuit such as flip-flops and counters. Chapter -5 represent the description on Memory systems and different logic families.