Definition:
Hexadecimal numbers or "hex" numbers are a base-16 numbering system used to define colors on Web pages. A hex number is written from 0-9 and then A-F.
Web colors are written as three sets of hex pairs. The first set represents the red hue, the second the green hue, and the third the blue. White is written as ff ff ff or #ffffff while black is 00 00 00 or #000000.
Also Known As: hex, hex codes
