Braille is a system of touch reading and writing for blind persons in which raised dots to represent the letters of the alphabet. There is a rectangular block called cells that represent a certain alphabet or number or another symbol. Each cell contain risen tiny dot and different combination of this dot is used to represent a different symbol.

Let take one example –

Louis Braille is a creator of Braille. He uses 3×2 dot in each cell to represent the alphabet.

Here is an image that shows how to represent ‘A’ in Braille (only one dot is raised) –

The blind people read this ‘A’ by moving the hand from left to right.

It is not possible to represent the whole symbol from 6 dots so in present Grade 3 Braille is used to which has maximum of 63 different available cells.