The transfer of information or power between two or more points which are not connected by an electrical conductor is known as wireless communication. Most of the wireless technologies make use of radio waves. There are different devices which are used for wireless communication such as cellular telephones and two-way radios. Some of the other means of wireless communications are free space optical communication, sonic communication and electromagnetic induction. Wireless network refers to a network of computers where wireless data connections between network nodes are used. The topics included in this book on wireless communications are of utmost significance and bound to provide incredible insights to readers. Also included herein is a detailed explanation of the various concepts and applications of this field. This book will serve as a valuable source of reference for graduate and post graduate students.