This is not only a coded way for communication between people with impaired hearing, definitely no. Actually it has its own beauty and should be considered as something more than a kind of linguistic science.
It is a brilliant way to express your thoughts using your body no matter of distance and noise around, and perhaps one day it will not be used only by people with impaired hearing! Wherever communities of all these people exist, sign languages will develop.
Hundreds of sign languages are in use around the world and are at the cores of local deaf cultures. We will turn your attention at some of them.