Because the value of each digit is 16 times the value of a unit in the digit to its right.
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Yes, the hexadecimal number 16.
(10)hex = (16)decimal
The hexadecimal system.
It is a method of counting, but instead of using placeholders for powers of 10, we use them for powers of 16. We count 1,2,3,...,9,A,B,C,D,E,F (here, A,...F represent 10 through 15). 16 in hexadecimal is written as 10, then 17 is 11, etc.
In the everyday decimal (base-10) system that everybody is familiar with, there is no digit greater than 10. In the hexadecimal system, with a base of 16, 'ten' is represented by 'A', and the symbols 'B', 'C', 'D', 'E', and 'F' are used to represent the digits 'eleven' through 'fifteen'.