Why hearing aid uses? What's different types for people 

A hearing aid is a small electronic device designed to improve hearing and speech understanding for people with hearing impairments. 

It generally consists of three basic elements: a microphone, an amplifier, and a speaker. The microphone receives sound, which is then amplified and sent to the speaker, which converts the electrical signal back into sound perceived by the user. 

There are several different types of hearing aids, including behind-the-ear (BTE) hearing aids, in-the-ear (ITE) hearing aids, fully-in-the-ear (CIC) hearing aids, and receiver-in-the-ear (RIC) hearing aids. 

Each type has its own advantages and disadvantages, and the choice of type depends on each individual's specific needs and preferences.

Hearing aids are primarily designed to help people with hearing loss improve their ability to hear and understand speech. 

They are especially useful for people who have hearing loss that is due to damage to the hair cells of the inner ear or the auditory nerve. There are several types of hearing loss, including:

Sensorineural hearing loss: This is the most common form of permanent hearing loss that is due to damage to the hair cells of the inner ear or the auditory nerve.

Conductive hearing loss: This type of hearing loss occurs when there is a problem in the middle ear, such as a blockage or damage to the eardrum, ossicles, or ear canal.

Mixed hearing loss: This type of hearing loss is a combination of sensorineural hearing loss and conductive hearing loss.

Hearing aids can help relieve the symptoms of hearing loss, but they do not cure the underlying condition.  

They amplify sound, which can improve communication and reduce the feelings of isolation and frustration that often accompany hearing loss.