Students, some of you asked about people who unable to hear. Here a diagram of the process for you.
“A cochlear implant is an electronic medical device that replaces the function of the damaged inner ear. Unlike hearing aids, which make sounds louder, cochlear implants do the work off damaged parts of the inner ear (cochlea) to provide sound signals to the brain.”*
* Google Search Engine: https://www.cochlear.com/au/home/understand/hearing-and-hl/hl-treatments/cochlear-implant