What is hexadecimal in computer terms?

Hexadecimal is a base 16 number system opposed to decimal being 10. This results in counting progressing as follows:-

1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 11, 12.....19, 1A, 1B, 1C, 1D, 1E, 1F, 20...9D, 9E, 9F, A0


The reason being, hexadecimal is a 2^n base system and decimal isn't, making it far more applicable to binary storage.