Contrast refers to the contrast of adjacent colors, (can be easily understood), the larger contrast image contour will be more distinct, but the contrast is not obvious part of the loss of more.
Saturation refers to the color, adjust the saturation color will change, the greater the tone, the more distorted the image color, adjust the saturation is only suitable for the picture of insufficient color. When the saturation level is minimized, the image loses color and is black and white!
Similar to the brightness adjustment of the TV, if the brightness is adjusted to a minimum will be black, the highest will be white.
You can find a page to print the text of the A4 paper as a test, the higher the contrast, the more obvious the outline of the text. The higher the saturation, the white color will be yellowing!
How to understand contrast, saturation, and brightness in camera settings