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Summary

Hexadecimal is a numbering system with base 16, which uses 16 symbols or possible digit values from 0 to 9, followed by six alphabetic characters -- A, B, C, D, E and F.
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It can be used to represent large numbers with fewer digits.
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Hexadecimal values are sometimes written with the prefix 0x (0x2F7) or with a subscript (2F7 16 ).
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It is a positional numeral system that represents numbers using a radix (base) of 16.
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Summaries from the best pages on the web

Summary
Hexadecimal is a numbering system with base 16. It can be used to represent large numbers with fewer digits.
In this system there are 16 symbols or possible digit values from 0 to 9, followed by six alphabetic characters -- A, B, C, D, E and F.

What is hexadecimal numbering? - TechTarget
techtarget.com

Summary
Hexadecimal numbers are based on the number 16 and can show 16 different values. They are the same as the decimal digits up to 9, but the letters A, B, C, D, E and F are added in place of the decimal numbers 10 to 15. Dogs would find hexadecimal easy to understand by counting on their toes.

Hexadecimals - Math is Fun
mathsisfun.com

The word hexadecimal is a mixture of the Greek hexa-prefix and the Latin-based -decimal suffix (related to decimus, "tenth"). In this way, one can think of hexadecimal as hexa-("six") +…

Hexadecimal number system (video) | Khan Academy
khanacademy.org

Summary
The word hexadecimal is a combination of hexa (meaning 6) and decimal (10). Binary is base-2, octal is base-8, and decimal is, of course, base-10.
Hexadecimal values are sometimes written with the prefix 0x (0x2F7) or with a subscript (2F7 16 ), but it doesn't change the value

What Is Hexadecimal? (Hexadecimal Definition) - Lifewire
lifewire.com