The transmission of signals, signs, messages, images, words and sounds by wire, radio, optical and other electromagnetic systems is known as telecommunications. The information is transmitted via transmission media or through electromagnetic radiation. The transmission paths are divided into communication channels in order to facilitate multiplexing. The technologies of telecommunication are broadly divided into wireless and wired methods. Some of the common media which make use of principles from telecommunications are telephone, radio, television, internet, local area network, etc. The three main elements of a telecommunication system are transmitter, transmission medium and receiver area. Transmitter is used to take information and convert it to a signal. The transmission medium carries the signal, and the receiver takes the signal from the channel and converts it to usable information for the recipient. The topics included in this book on telecommunications are of utmost significance and bound to provide incredible insights to readers. It covers in detail some existing theories and innovative concepts related to this field. This textbook attempts to assist those with a goal of delving into this field.