Answer:
Value deals with the lightness or darkness of a color. Since we see objects and understand objects because of how dark or light they are. Value deals directly to light. We see things because light reflects off of objects and goes into our eyes. Our mind processes the light and rationalizes what we are seeing. Without light, we cannot see anything. In order to draw or paint in a way that creates an illusion of what we normally see, we must fully understand light and how it reacts on surfaces. Value is the key to the illusion of light. This is why value is so incredibly important to drawing and painting.
https://thevirtualinstructor.com/Value.html
