In the computer, all data are represented as binary digits (bits), and eight binary digits make up one byte. For example, the upper case letter A is 0101001. Numbers however can take several forms.

Hexadecimal close hexadecimalA number system using 16 symbols from 0-9 and A-F, also known as base 16 and hex., also known as hex, is the third commonly-used number system and is base 16.