There are various instruments that can help a deaf person hear the sounds. To define a hearing aid, it can be said that it is a device, electro acoustic in nature which aid in hearing. Hearing aids are fitted behind the ear. It is used for modulating and amplifying the sound of a person that wears it. Before, these devices were termed as trumpets of ear or horns of ear and had a funnel-like shape. There are different types of hearing aids that but not all can be termed as best digital hearing aids. Moreover, every hearing aid is not digital. They are : Body worn aids, behind the ear aids, in the ear aids, Receiver IN the Canal aids, In the Canal mini aids ( or completely in the canal aids),Invisible In the canal (ITC) aids and extended wear hearing aids.

Body worn hearing aids were the first kind of hearing tools that were invented. Harvey Fletcher invented them. They have an ear mold, a cord and a case. But these hearing aids were substituted by BTE i.e. Behind the Ear hearing aids. Their advantage over body worn aids is that the sound can be extracted electrically or acoustically as adverse to the body worn aids. For those suffering from severe or not so serious hearing loss, ITE i.e. ‘In The Ear' haring Aids are required. But children are not required to wear these aids as it is difficult to modify their fit due to constant growth in children. Receiver ‘In The Canal' hearing aids are quite of the similar kind as BTE. But there is one difference between them that is that in it, the speaker is fixed inside the canal of the ear of a person whereas in BTE, the acoustic tube is replaced by electric wires. But RIC are better than BTE.

Talking about the best digital hearing aids, In The Canal , Mini Canal and Completely In The Canal hearing aids are mostly preferred; the first one is very small in size and requires only the bottom part of the external ear whereas CIC and MIC are so small that they cannot be visible with a casual look at the hearer. These hearing aids are referred to those who suffer mild or severe hearing losses. IIC i.e. ‘Invisible In The Canal' hearing aids are most demanded ones as they cannot be seen and the defect of a hearing loss is obliterated. They can be easily fit into the ears of the hearer.