Why Hex Code?
Because math.
​Hex colors are based on the RGB color paradigm, which has been used in photography since its inception. By assigning different combinations of red, green, and blue to each eye, you may produce practically any color the eye can perceive. The entire number of potential color combinations is 16,777,216, which is more than the human eye can recognize.
Programmers favor hex color coding because they are predictable. They are always six digits, regardless of color. RGB values might be as little as three or as much as nine digits. It is not necessary to employ hex codes in web design. When coding a page in HTML, you may also utilize RGB values or even color names.
Source: Image​
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