The hexadecimal number system, also called base-16 or sometimes just hex, is a number system that uses 16 unique symbols to represent a given value. Those symbols are 0-9 and AF.
Hexadecimal number system
The number system we use in everyday life is called the decimal system or the base 10 system. This system consists of 10 symbols from 0 to 9 to represent a value.
Most error codes and other values used in a computer are displayed in hexadecimal format. For example, STOP codes displayed on a Blue Screen of Death are always in hexadecimal format.
Programmers use hex because the values in this notation are shorter than in decimal notation, and much shorter than in binary notation, which uses only 0 and 1.
