RGB
A way of making and describing colour by mixing red, green and blue light.
Also: red green blue
RGB is the colour model of screens. Every pixel is made of red, green and blue lights, and each is given a strength, most often a whole number from 0 to 255. All three at zero is black; all three at full is white; red and green at full with no blue is yellow. This gives about 16.7 million combinations. RGB numbers alone do not say exactly which colour is meant. That depends on the colour space, such as sRGB, that the numbers are understood to be in.