Blue is one of the tree primary colors of pigments.
What are the other primary color pigments?
The RGB color model is made up of red, green and blue light.
What else do you know about the light spectrum?
I know that the RGB color model is largely used today in the electronic age because they are the 3 colors that are most perceptible to humans,.
Ahhh that makes sense. So it's used on computers and smartphones? 
Yeah the main purpose is for the representation and display of image in electronic systems.