The cochlear implant (CI) is an option for most people with severe hearing loss in the inner ear to regain the ability to hear and understand speech. Those who, despite high-quality hearing aids, can no longer understand speech can benefit from this electronic inner ear prosthesis. This guide explains the structure and functioning of a CI, as well as defining the type of hearing impairment that can be treated with a CI, starting from the intact function of hearing. It discusses the necessary preliminary examinations and consultations at specialized CI centers. The personal and time commitment required for the follow-up and rehabilitation phase is described. Additionally, the guide provides a checklist for selecting a CI clinic, answers to common questions related to CI provision, and interesting resources for patients with a CI.