Cochlear implantation is a complex medical and technological intervention and a significant area of research focused on restoring auditory perception in individuals with severe-to-profound hearing loss. This field encompasses the investigation of surgically implantable electronic devices that bypass damaged parts of the ear to directly stimulate the auditory nerve, studying aspects ranging from device design, surgical techniques, and physiological mechanisms to neural plasticity, speech processing strategies, and long-term patient outcomes and rehabilitation. Its significance lies in providing auditory access for individuals unresponsive to conventional amplification, representing a major advancement in audiology, bioengineering, and neuroprosthetics.