## Table of contents

## Definition

ASCII stands for **American Standard Code for Information Interchange**, a set of chosen numbers used to represent letters, numbers, and unique actions.

## Use cases and Examples

`065`

is the number used to represent `A`

.

The question then is why and for what reason do we need this mapping?

Well, computers store data using an `on`

and `off`

state like a light bulb. We represent this using the numbers `1`

and `0`

, respectively.

If we wanted to store `A`

what would be the approach? The easiest answer is to represent it using a number since that's all we can store with the computer (more or less). But we have way more than two alphabets so `0`

and `1`

is not enough. But if you pair more `0`

s and `1`

s together, for example, `01000001`

, you can store all the alphabet. And since we can convert binary numbers to decimal numbers, we can convert `01000001`

to `065`

. This decimal is what is known as ASCII.

## Summary

This number-to-character mapping allows computers to interpret the information stored as binary back to readable text.

Also, representing a computer's `on`

and `off`

state as binary allows engineers to present electronics and computation in mathematical form for example, boolean algebra [↗] and logic gates [↗].

Here is another article you might like 😊 "What Is Authentication?"