The level of color intensity. High saturation provides bright colors, while low saturation appears more muted.
In lighting, saturation describes the amount of brightness a color appears to have on an island. In Contrast, lightness tells how dark or light a specific color is. Color saturation can mute colors which yields a grayscale or black-and-white appearance, or it can over-saturate a specific color or range of colors making them more vivid.