What is the black shadow in an art piece called?

The black shadow in an art piece is often referred to as a "shadow" or "cast shadow." It represents the area that is blocked from light by an object, adding depth and dimension to the artwork. Shadows help create a sense of realism and can also enhance the overall composition by emphasizing shapes and forms. In some contexts, it may also be referred to as "chiaroscuro" when discussing the interplay of light and dark in painting.