In number bases, Hexadecimal or simply Hex, is a number system represented in base 16. The decimal system can represent only 10 digits while the hex system has 16 digits. In hex, the number bases system is represented as 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F. The hex number system is mostly used in information technology. For example, it can be used to represent color in HTML programming language: white is represented by FFFFFF while black is represented by 000000.