Why do we use CMYK color for printing?

[shivajikobardan]

I will tell my research that i have done earlier here.

CMYK is used for print pieces like brochurers and business cards.
For RGB we need to start on black paper but we can't add light until we reach white because light can't be painted on surface, what does this bold content means to say?
in a monitor, light is being emitted (or added)when you add r,g,b you get white...in ink light is being absorbed(or subtracted) and when you absorb r,g,b you get black

if rgb is used, you get strange, muddy, and incorrect colors from printer. (but the question is why)

cmy cover most lighter color range quite easily compared to rgb.

I want if possible some mathematical representations of this...thanks

 

[I like Serena]

Paint absorbs light. When we apply multiple layers of paint, more light is absorbed and the resulting color is darker.
Light is additive. Adding more light of a different color makes it lighter.

The painting colors cyan, magenta, and yellow are the opposite of the monitor colors red, green, and blue.
We might put that in formula form as $cyan = 1 - red, magenta = 1 - green, yellow = 1 - blue$.
Since mixing colors equally generally isn't quite gray, black is added as an additional color. The K in CMYK stands for blacK.

Btw, printing professionals tend to refer to cyan, magenta, and yellow as the colors blue, red, and yellow, which is what we learn in primary school as the primary colors..