This book provides an illustrative elucidation on the functioning and applications of piezoelectric transducers. A piezoelectric transducer transforms electric signals into mechanical vibrations or vice versa by using the morphological alteration of a crystal which occurs on voltage application, or conversely by monitoring the voltage produced by a pressure applied on a crystal. This book describes state of the art research and advanced outcomes in this wide domain using original and innovative research studies presenting several investigation directions. This book is an outcome of contributions of experts from international scientific community working in various aspects of piezoelectric transducers and has been directed towards researchers, professional engineers, students and other experts in various academic and industrial disciplines, seeking to attain an improved understanding of current advances in the field and challenges which lie in this area.