The process of collecting energy from sources like wind, solar, thermal and other energy resources, in order to store it in electronic devices is called energy harvesting. The different methods of energy harvesting are photovoltaic energy harvesting, wireless energy harvesting, piezoelectric energy harvesting, pyroelectric energy harvesting, etc. This book explores all the important aspects of energy harvesting in the present day scenario. It unfolds the innovative aspects of this field which will be crucial for the holistic understanding of the subject matter. This textbook is meant for students who are looking for an elaborate reference guide on energy harvesting and have the desire to understand the various applications and models of the subject.