Hexidecimal

Introduction
Hexidecimals is a numbering system that includes the alphabet, allowing 16 total possibly numbers for a single digit, making it a very efficient way to store data.

Uses
It is used in the coding for colours. How this works: there are six digits in the coding for colours. There are three base colours on which each colour is based on: red, green and blue. The six digits are split into pairs of two where each pair is responsible for the amount of each base component in the colour. Notice that sixteen multiplied by sixteen is 256. In any advanced picture editing program, you will notice that the amount of any base component ranges from 0-255, which is 256 possible outcomes. Therefore one can assume that each pairing of digits in the coding system for colours is representative of the amount of a base component in any colour.