Our eyes can see a wide variety of colours, but not all of those colours can be printed. There are many compromises happening with colour when our eyes are viewing colours represented on an RGB display like our phones, or a CMYK printout on a billboard, or a swatch in a Pantone Colour Guide, or a spot-colour Screen Printed on a t-shirt.
Use our Colour Gamut Comparison to get an idea of the range of colours that can be seen by our eyes, versus displayed on a screen, mixed with the Pantone System, or with CMYK inks.