The subtractive color model is a way of combining colors to make other colors. It's like using puzzles or Legos to make a picture. You start with some colors, and you combine them together to make a new color.
For example, red and green are two colors. When you combine red and green, you get a new color called yellow. You can make all the other colors using the same technique. If you mix blue and yellow, you get green. If you mix yellow and red, you get orange.
The subtractive color model is used in things like printing, painting, and other art projects. That's why it's important to know how colors work when you're creating something.