Hue is the most obvious characteristic of a color. It’s what most people mean when they say the word “color.” There are really an infinite number of possible hues. For instance, between red and yellow lies every possible orange hue.
Chroma refers to the purity of a color, its intensity or saturation. High chroma colors look rich and full. Low chroma colors can look dull or pale. Pastel colors are low chroma, while intense jewel tones are high chroma. Chroma is also referred to as saturation.
Value is the lightness or darkness of a color. Sometimes light colors are called tints, and dark colors are called shades. Value is referred to as luminence in the color sphere below.