Racism is a system of beliefs, practices, social classifications and institutional arrangements that treats people as belonging to supposedly distinct racial groups and attaches unequal value, characteristics, opportunities or treatment to those classifications. Historically, racist ideologies have often claimed that human populations can be divided into biologically distinct racial types with inherited differences in intelligence, morality, behaviour or capability.
Modern genetics does not support the idea that socially defined racial categories correspond neatly to discrete biological races, although human populations contain patterns of ancestry and genetic variation. Racism can nevertheless have powerful social consequences because racial classifications are created, maintained and acted upon by institutions and individuals. The concept therefore encompasses explicit prejudice and hostility as well as less overt practices through which racial categories become associated with unequal treatment, status and access to resources.
The history of Racism is connected to colonialism, slavery, imperial expansion, nationalism, scientific racism and the development of racial classification systems. European intellectual traditions from the early modern period increasingly categorised human populations according to physical characteristics, geography and purported civilisational differences. During the nineteenth and early twentieth centuries, some scholars promoted racial hierarchies using distorted interpretations of biology, anthropology and evolutionary theory. Eugenics subsequently attempted to apply hereditarian ideas to social policy and reproduction. These historical doctrines provided intellectual justification for forms of exploitation, segregation, exclusion and political domination. Contemporary racism does not necessarily reproduce nineteenth century biological theories explicitly, but historical racial classifications can continue to influence institutions, stereotypes, residential patterns and distributions of wealth and opportunity.
Racism can operate at different levels. Individual or interpersonal racism occurs through interactions between people, such as racial insults, exclusion, unequal treatment or harassment. Institutional racism concerns policies, procedures or organisational practices that produce or maintain racial disadvantage, whether or not individual decision makers consciously intend such an outcome. Structural racism refers more broadly to interconnected social institutions and historical processes that reproduce racial inequalities across society. These levels can overlap. An individual decision may reflect a stereotype that is widespread within an institution, while institutional practices may themselves have developed from earlier systems of explicit racial exclusion. Distinguishing levels is useful because different mechanisms require different forms of evidence and different responses.
Racism can be expressed through explicit beliefs as well as implicit assumptions and ordinary practices. Explicit racism involves openly expressed claims of racial superiority, inferiority or exclusion. More indirect forms can involve coded language, stereotypes, assumptions about competence or trustworthiness, selective social interaction and apparently neutral rules that have unequal effects. The existence of implicit attitudes does not mean that every unequal outcome is consciously motivated by racism.
Researchers therefore distinguish attitudes, behaviours, institutional practices and structural outcomes rather than treating them as interchangeable. This distinction is important because a person can participate in a practice that contributes to racial inequality without personally endorsing an explicit racist ideology, while explicit prejudice can exist without producing substantial institutional power in a particular setting.
Racism has frequently been connected to the distribution of power and resources. Historically, racial classifications have been used to justify restrictions on citizenship, voting, land ownership, migration, employment, education, housing and political participation. Segregation systems have physically separated populations, while colonial systems have subordinated populations through political and economic institutions. Contemporary forms may involve less explicit legal exclusion but can still interact with labour markets, housing systems, education and criminal justice. The persistence of racial inequalities can therefore reflect cumulative historical processes rather than a single discriminatory event. Analysing Racism requires attention to both immediate interactions and the institutional histories that shape present opportunities.
Racism is distinct from racial categorisation itself. People can use racial or ethnic categories for purposes such as demographic research, identity, cultural organisation or monitoring discrimination without necessarily expressing racist beliefs. The analytical challenge is to distinguish classification from hierarchy. Similarly, racial identity is not synonymous with racism because people can identify with a racial group without assigning superiority or inferiority to another group.
Racial prejudice refers specifically to attitudes or evaluations involving racial groups, while racism is often used more broadly to encompass relationships between prejudice, discrimination, power and institutional structures. Different academic traditions define the boundaries of the term differently, so the precise definition should be made explicit in research.
Racism can have effects on individuals and communities even when it is not experienced as a single dramatic incident. Repeated stereotypes, unequal opportunities, social exclusion, differential treatment and expectations can influence educational experiences, employment opportunities, housing access and interactions with institutions. Exposure to racial hostility can also affect trust in institutions and willingness to participate in public life. These effects should not be reduced to psychological responses alone because racism can influence material resources and social opportunities. At the same time, people within the same racial category can have very different experiences because class, gender, age, nationality, migration status, religion and locality interact with racialisation.
Understanding Racism requires careful separation of documented facts from claims about motives. A racial disparity does not by itself establish the mechanism that produced it, and the absence of an explicit racist statement does not by itself prove that no racialised process was involved. Researchers therefore examine patterns of treatment, historical context, institutional rules, statistical outcomes, testimony and alternative explanations. Racism remains a major concept in sociology, history, anthropology, political science, law and social psychology because it helps analyse how racial categories become connected to unequal status and treatment. Its study requires attention to ideology, behaviour, institutions, history and social structure rather than reliance on any single dimension.
