Tints and Shades
In color theory, a tint is the mixture of a color with white, which increases lightness, and a shade is the mixture of a color with black, which reduces lightness or increases the darkness.
Mixing a color with any neutral color, including black and white, reduces the chroma, or colorfulness, while the hue remains unchanged. It is common among some artistic painters to darken a paint color by adding black paint—producing colors called shades—or to lighten a color by adding white—producing colors called tints.
Monochromatic colors are all the colors (tints, tones, and shades) of a single hue. Here the term single hue means we are using just one color that is red to obtain tints and shades. The red color doesn’t have any other color mixed to it.