Any of the different varieties of humanity assumed by some people to exist, based on the discredited typological model of human variation. Such "races" are commonly distinguished on the basis of visibly observable traits such as skin color, hair form, and body shape. From a biological perspective, the term race should be reserved for distinct varieties or sub-species. In the U. S. And other nations that use the concept of race, it refers mainly to culturally created realities rather than biological differences.