A hearing aid can be defined as any device whose function is to amplify the acoustic signals to a degree that enables a hearing-impaired individual to use his or her remaining hearing in a useful and efficient manner.

The first hearing aids were mechanical resonating devices that included tubes and horns of various sizes.

In the early 1900s, electrical instruments replaced mechanical hearing aids.
The first truly wearable electrical hearing aid was manufactured in the 1930s;
in the 1950s, transistors were introduced into hearing aids.

Since the 1950s, hearing aids have become smaller, and battery cost has lessened.
In the 1990s, programmable digital hearing aids were developed, which
allow for clearer sound quality and precise fitting paradigms.

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