Radio Frequency Identification (RFID) is used to track things and people by using electromagnetic fields. This technology is very useful as it allows us to track almost anything which can be attached to RFID. It is currently being used in industries like, automobiles industry, pharmaceutical industry, clothing, books, and is even being used in husbandry, as animals get implanted with the trackers. The book aims to shed light on some of the unexplored aspects of radio frequency identification. Most of the topics introduced in it cover new techniques and the applications of this technology. Different approaches, evaluations and methodologies and advanced studies have been included in it. As this field is emerging at a rapid pace, the contents of this textbook will help the readers understand the modern concepts and applications of the subject.