“Race” is a debated term that refers to the categorization of humans based on physical features, including skin color. In racial thinking the color of one’s skin is regarded as a sign of incommensurable difference between groups, including a hierarchy in aptitude, abilities, even behavior and development. According to 18th- and 19th-century racial sciences, humans were divided into different groups, arranged hierarchically. These typologies reinforced colonial ideologies of difference, with the White European at the top of a racial hierarchy (see also “Caucasian” and “Negro”). While race is not a biological fact, it has social consequences, for example in discrimination, prejudice and inequality. Racism, therefore, should be understood as a form of prejudice and discrimination based on the presumed superiority of one group over another.