RGB (Red Green Blue) color model refers to the three color components used in digital displays, televisions, smartphones, tablets, and similar devices to produce full-color images.
Adding together the three colors in varying quantity produces 16.7 million visible colors. Modern monitors are capable of displaying a wide color range, though not all colors can be faithfully displayed due to a restricted gamut.
RGB color is the standard color model for digital images, through there are other color models. Providing images in RGB color mode usually allows the most flexibility for image manipulation, color correction, delivery via digital media, and conversion for use in print media.
Alternate color models include CMYK, Grayscale, and Lab.