Hearing aids amplify sounds, but do not correct sound distortions. Some hearing aids developed in the past few years DO have the ability to amplify selective sounds.
Hearing aids are all the same.
There are over 500 different types of hearing aids. There are hearing aids that can be worn, behind the ear, on the eyeglasses, or inside the ear canal. Each type of hearing aid has different advantages and disadvantages. Hearing aids are embarrassing and make people look older. Having a hearing aid requires the owner to have excellent manual dexterity.