Hexadecimal Numbers  Binary Numbers 

Hexadecimal numbers make use of 16 symbols 0 to 9 and additional symbols (A, B, C, D, E, F). Hexadecimal numbers were introduced with the purpose to represent binary numbers in a more human readable form.  Binary numbers make use of only 2 symbols (0, 1) to represent any number and it becomes a tedious job to express large numbers. 
The radix or base for hexadecimal number is 16 and each symbol in a hexadecimal number is expressed as power of 16.  The radix for binary numbers is 2 and also termed as base 2 numbers. 
It is easy and more human readable to represent number in hexadecimal system.  Large numbers represented in binary system are not in a human readable form. 
Example of Hexadecimal number : FF (Equivalent to Two hundred and fifty five in decimal)  Example of Binary number : 11111111 (Equivalent to Two hundred and fifty five in decimal) 
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