Black Versus Rich Black, whats the difference?

Rich black versus Regular black, so the main difference is the deepness of the black and how much color is in it. Regular black only uses the k of cmyk, which is just black ink. While Rich black uses all colors from cmyk, (cyan, magenta, yellow, and black) resulting in a much darker and deeper black color. And here is the way to use/ check for it Settings when designing for print, window> attriibutes> overprint fill, (check box option), VIew> over print preview (Toggle between off and on)