This book is a comprehensive illustration of content covering cochlear implants  past, present, and future perspectives. It delves into history, about how the first implant was conceived around 50 years ago and how modern cochlear implants provide better hearing and speech discrimination with the evolution of technology. This book discusses the basic working principles of cochlear implants, along with a review of their clinical use. The book also elaborates upon the various surgical techniques authored by clinicians who are pioneers. This book covers various important topics such as implantation in abnormal cochleas, bilateral implantation, implanting with acoustic and electric stimulation, and re-implantation. The book guides selecting the suitable candidates, describing preoperative evaluation and imaging techniques.