Digital technology is a core topic in the study of electrical engineering and information technology. This book covers all the essential fundamentals of digital technology: signals, conversions, number systems, information representation and coding, code security, error detection and correction, data compression and reduction, cryptography and data security, communication, bus systems, interfaces, Boolean algebra, functional units of digital technology, simulation of digital circuits, flip-flops in digital technology, digital circuit families, basics of programmable logic, description of digital circuits using VHDL, introduction to microprocessor technology, fundamentals of automata theory, and a look at future developments. It provides clear and comprehensive foundational knowledge on various topics in digital technology. The fundamental workings and methods of digital circuits and their practical applications are the focus of the discussions.