Recent advances in communication technologies have been unprecedented. The migration form analogue communication tools and techniques to digital communication system has opened up a host of applications in business, entertainment and commerce. The communication revolution is changing the world and shrinking space and time. The communication technologies are introducing an array of new opportunities and new choices that were unimaginable just a short time ago. As the world moves from analog to digital, it becomes increasingly apparent that for development and success in future. People from all walks of life would have through understanding of digital communication and related developments. This dictionary is a comprehensive treatment of digital communication, covering terms, phrases and concepts of this rapidly growing field. It is intended for students, teachers, communication professionals and all who are interested in understanding digital communication deeply.