Answer:
Hexadecimal numbers are numbers in base sixteen. They are
expressed using groupings of units, sixteens, (sixteens)_{2}
and so on. In addition to the digits 0,1, 2, …, 9, the
letters A, B, C, D, E and F are used to represent the numbers
ten to fifteen.
For
example, the hexadecimal number 23D stands for 2 x 256 + 3
x 16 + 13 in base ten which is 573.
Hexadecimal
numbers are used in electronics and information technology
(for example, in specifying background and text colours on
Internet web pages). They are more compact than binary numbers
since they use fewer heights but they can easily be converted
into binary numbers, and vice versa.
For
example, to express 47_{sixteen} as a binary number, write each
digit as a binary number with four columns and then delete
any zeros on the left.
47_{sixteen} = 0100_{two}  0111_{two} = 1000111_{two}.
