What is the use of tints and shades in a painting primarily meant to show?

The use of tints and shades in a painting is primarily meant to show value. In colour theory, value refers to the lightness or darkness of a colour. A tint is created by adding white to a pure colour, making it lighter. A shade is created by adding black to a pure colour, making it darker. Together, tints and shades allow an artist to show a full range of values - from the lightest highlight to the deepest shadow - using a single hue.

Hue is the name of a colour itself (red, blue, green) and is not changed by adding white or black. Saturation (also called chroma or intensity) refers to how vivid or muted a colour is. Temperature describes whether a colour appears warm (reds, oranges, yellows) or cool (blues, greens, violets). None of these properties is what tints and shades primarily demonstrate.