The hex system, also hexadecimal, is a number system of base 16. Since the decimal system only has 10 digits, the remaining 6 digits are represented by A, B, C, D, E, F.With modern computers, where a byte is normally containing eight binary digits, Hexadecimal is an easy way to express binary numbers.
The decimal system is an old and commonly used numbers system. Also called base 10 numbering because it consists of 10 single digits: 0,1,2,3,4,5,6,7,8,9. Example: The Hex value of ‘15’ is F and its binary value is 1111