Digital communication, also called data transmission, refers to the transfer of data physically from one device to another, over point to point communication channels or point to multipoint communication channels, for example wireless communication channels, copper wires, computer buses, optical fibers, etc. The data is transferred in the form radio-waves, infrared signals, microwaves, etc. This book is compiled in such a manner, that it will provide in-depth knowledge about the theory and practice of digital communication. Some of the diverse topics covered in this textbook address the varied branches that fall under this category. Different approaches, evaluations and methodologies and advanced studies on digital communications have been included in it. Those in search of information to further their knowledge will be greatly assisted by this text.