What is the difference between RGB and CMYK. What is Pantone Color?
RGB and CMYK are colorspaces that are used with specific digital imagery (raster or vector). As CMYK is the color of inks used in the offset printing process and RGB is the color of the light emitted from a computer monitor, each colorspace has a specific use. CMYK is generally used for producing and printing photos (where such can be easily manipulated by adjusting tones, contrast and mixing the color palette via Photoshop) while RGB is used for viewing images on screen (usually as vector and via Illustrator).
Pantone color refers to an elaborate palette system consisting of codes assigned to every color and its shades in existence (presumably). There are a total of 1757 unique and individually numbered colors and one could look these codes up online and enter the digits in Illustrator’s color palette to obtain a specific hue. In my experience, I frequently do this to get exact shades with my web projects.