Any color has three basic properties - it's hue, its tone, and its intensity. Hue means the color as identified by its name - red or blue, for example. Tone means the lightness or darkness of a color. You can, for instance, have a light blue or a dark blue. In addition to the properties of hue and tone, colors have a varying degree of intensity. Two reds may be identical in tone and yet be clearly different, with one more intense, or brighter, than the other. The difference in intensity is sometimes called color saturation.
When you use the word color, you are generally referring to these three properties - hue, tone, and intensity - simultaneously. However, it is helpful to be able to identify them separately because when you notice that a color is "wrong", you will be better able to pinpoint what is wrong with it - whether it is too light in tone or too intense.