Racism consists of both prejudice and discrimination based in social perceptions of biological differences between peoples. It often takes the form of social actions, practices or beliefs, or political systems that consider different races to be ranked as inherently superior or inferior to each other, based on presumed shared inheritable traits, abilities, or qualities. It may also hold that members of different races should be treated differently.[1][2][3]

Among the questions about how to define racism are the question of whether to include forms of discrimination that are unintentional, such as making assumptions about preferences or abilities of others based on racial stereotypes, whether to include symbolic or institutionalized forms of discrimination such as the circulation of ethnic stereotypes through the media, and whether to include the socio-political dynamics of social stratification that sometimes have a racial component.

In sociology and psychology, some definitions only include consciously malignant forms of discrimination.[4][5] Some definitions of racism also include discriminatory behaviors and beliefs based on cultural, national, ethnic, caste, or religious stereotypes.[2][6] One view holds that racism is best understood as 'prejudice plus power' because without the support of political or economic power, prejudice would not be able to manifest as a pervasive cultural, institutional or social phenomenon.[7][8][9]

While race and ethnicity are considered to be separate phenomena in contemporary social science, the two terms have a long history of equivalence in popular usage and older social science literature. Racism and racial discrimination are often used to describe discrimination on an ethnic or cultural basis, independent of whether these differences are described as racial. According to the United Nations convention, there is no