A hex color code is a six-digit combination of numbers and letters, preceded by a # symbol. Each pair of characters in the code represents the intensity of red, green, and blue (RGB) in a particular color.
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Hexadecimal (hex for short) is a positional numeral system for representing a numeric value as base 16. For the most common convention, a digit is represented as "0" to "9" like for decimal and as a letter of the alphabet from "A" to "F" (either upper or lower case) for the digits with decimal value 10 to 15.
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Hex uses 16 digits including 0-9, just as the decimal system does, but also uses the letters A, B, C, D, E, and F (equivalent to a, b, c, d, e, f) to represent the numbers 10-15. Every hex digit represents 4 binary digits, called nibbles, which makes representing large binary numbers simpler.
Hexadecimal color values are supported in all browsers. A hexadecimal color is specified with: # rrggbb. Where rr (red), gg (green) and bb (blue) are hexadecimal integers between 00 and ff, specifying the intensity of the color.
Meaning of hex or hexadecimal numbering, a base-16 system using digits 0-9 and letters A-F, commonly used in computing for color codes and data representation.