The Population Registration Act of 1950 required that each inhabitant of South Africa be classified and registered in accordance with their racial characteristics as part of the system of apartheid.

Social rights, political rights, educational opportunities, and economic status were largely determined by the group to which an individual belonged. There were three basic racial classifications under the law: Black, White and Coloured (mixed). Indians (that is, South Asians from the former British India, and their descendants) were later added as a separate classification as they were seen as having "no historical right to the country".

An Office for Race Classification was set up to overview the classification process. Classification into groups was carried out using criteria such as outer appearance, general acceptance and social standing. For example, it defined a "white person" as one who "in appearance is obviously a white person who is generally not accepted as a coloured person, or is generally accepted as a white person and is not in appearance obviously a white person." Because some aspects of the profile were of a social nature, reclassification was not uncommon, and a board was established to conduct that process. The following criteria were used for separating the coloured people from the white people:

Characteristics of the person's head hair

Characteristics of the person's other hair

Skin colour

Facial features

Home language and especially the knowledge of Afrikaans

Area where the person lives, the person's friends and acquaintances

Employment

Socioeconomic status

Eating and drinking habitsThis law worked in tandem with other laws passed as part of the apartheid system. Under the Prohibition of Mixed Marriages Act of 1949, it was illegal for a white person to marry a person of another race. With the enactment of the Immorality Amendment Act of 1950, it also became a crime for a white person and a person of another race to have sexual intercourse.

Under the act, as amended, Coloureds and Indians were formally classified into various subgroups, including Cape Coloured, Malay, Griqua, Chinese, Indian, Other Asian and Other Coloured.The South African Parliament repealed the act on 17 June 1991. However, the racial categories defined in the act remain ingrained in South African culture and they still form the basis of some official policies and statistics aimed at redressing past economic imbalances (Black Economic Empowerment and Employment Equity).

Apartheid (, especially South African English: , Afrikaans: [aˈpartɦɛit]; transl. "separateness", lit. "aparthood") was a system of institutionalised racial segregation that existed in South Africa and South West Africa (now Namibia) from 1948 until the early 1990s. Apartheid was characterized by an authoritarian political culture based on baasskap (boss-hood or boss-ship), which ensured that South Africa was dominated politically, socially, and economically by the nation's minority white population. According to this system of social stratification, white citizens had the highest status, followed by Indians and Coloureds, then black Africans. The economic legacy and social effects of apartheid continue to the present day.Broadly speaking, apartheid was delineated into petty apartheid, which entailed the segregation of public facilities and social events, and grand apartheid, which dictated housing and employment opportunities by race. The first apartheid law was the Prohibition of Mixed Marriages Act, 1949, followed closely by the Immorality Amendment Act of 1950, which made it illegal for most South African citizens to marry or pursue sexual relationships across racial lines. The Population Registration Act, 1950 classified all South Africans into one of four racial groups based on appearance, known ancestry, socioeconomic status, and cultural lifestyle: "Black", "White", "Coloured", and "Indian", the last two of which included several sub-classifications. Places of residence were determined by racial classification. Between 1960 and 1983, 3.5 million black Africans were removed from their homes and forced into segregated neighbourhoods as a result of apartheid legislation, in some of the largest mass evictions in modern history. Most of these targeted removals were intended to restrict the black population to ten designated "tribal homelands", also known as bantustans, four of which became nominally independent states. The government announced that relocated persons would lose their South African citizenship as they were absorbed into the bantustans.Apartheid sparked significant international and domestic opposition, resulting in some of the most influential global social movements of the twentieth century. It was the target of frequent condemnation in the United Nations and brought about an extensive arms and trade embargo on South Africa. During the 1970s and 1980s, internal resistance to apartheid became increasingly militant, prompting brutal crackdowns by the National Party government and protracted sectarian violence that left thousands dead or in detention. Some reforms of the apartheid system were undertaken, including allowing for Indian and Coloured political representation in parliament, but these measures failed to appease most activist groups.Between 1987 and 1993, the National Party entered into bilateral negotiations with the African National Congress (ANC), the leading anti-apartheid political movement, for ending segregation and introducing majority rule. In 1990, prominent ANC figures such as Nelson Mandela were released from prison. Apartheid legislation was repealed on 17 June 1991, leading to multiracial elections in April 1994.