About these color formats
HEX and RGB are the standard formats for screens and CSS - HEX is compact (#3B82F6), RGB is explicit about each channel (0-255). HSL (hue, saturation, lightness) and HSV (hue, saturation, value/brightness) describe color more the way people think about it - easier for picking a shade or a tint of the same hue. CMYK (cyan, magenta, yellow, key/black) is for print, where color is created by mixing ink rather than emitting light.