Dalit in the context of "Two-nation theory"

Untouchability is a form of social institution that legitimises and enforces practices that are discriminatory, humiliating, exclusionary and exploitative against people belonging to certain social groups. Although comparable forms of discrimination are found all over the world, untouchability involving the caste system is largely unique to South Asia.

The term is most commonly associated with treatment of the Dalit communities in the Indian subcontinent who were considered "polluting". The term has also been used to refer to other groups, including the Burakumin of Japan, the Baekjeong of Korea, and the Ragyabpa of Tibet, as well as the Romani people and Cagot in Europe, and the Al-Akhdam in Yemen. Traditionally, the groups characterized as untouchable were those whose occupations and habits of life involved ritually "polluting" activities, such as pursuing a career based on killing (e.g. fishermen) or engaging in common contact with others' feces or sweat (e.g. manual scavengers, sweepers and washermen).

The Scheduled Castes (SCs) and Scheduled Tribes (STs) are officially designated groups of people and among the most disadvantaged socio-economic groups in India. The terms are recognized in the Constitution of India and the groups are designated in one or other of the categories. For much of the period of British rule in the Indian subcontinent, they were known as the Depressed Classes.

In modern literature, many castes under the Scheduled Castes category are sometimes referred to as Dalit, meaning "broken" or "dispersed". The term was popularised by the Dalit leader B. R. Ambedkar during the independence struggle. Ambedkar preferred the term Dalit over Gandhi's term Harijan, meaning "people of Hari" (lit. 'Man of God'). Similarly, the Scheduled Tribes are often referred to as Adivasi (earliest inhabitants), Vanvasi (inhabitants of forest) and Vanyajati (people of forest). However, the Government of India refrains from using these terms that carry controversial connotations. For example, 'Dalit', which literally means 'oppressed', has been historically associated with notions of uncleanness, carries implications of the concept of untouchability. Similarly, 'Adivasi', which means 'original inhabitants', carries implications of native and immigrant distinctions and also perpetuates the stereotypes of being civilized and uncivilized. Therefore, the constitutionally recognized terms "Scheduled Castes" (Anusuchit Jati) and "Scheduled Tribes" (Anusuchit Janjati) are preferred in official usage, as these designated terms are intended to address socio-economic disabilities, rather than to reimpose those social stigmas and issues. In September 2018, the government issued an advisory to all private satellite channels asking them to refrain from using the derogatory nomenclature 'Dalit', though rights groups have come out against any shift from 'Dalit' in popular usage.

In India, social classification based on caste has its origin in ancient times. It was transformed by various ruling elites in medieval, early-modern, and modern India, especially in the aftermath of the collapse of the Mughal Empire and the establishment of the British Raj. Caste is traditionally associated with Hinduism, but is more pervasive in extent: an estimated 98% of contemporary Indians, including Hindus, Muslims, Christians, Sikhs, Buddhists, and Jains, identify with a caste.

Beginning in ancient India, the caste system was originally centered around varna, with Brahmins (priests) and, to a lesser extent, Kshatriyas (rulers and warriors) serving as the elite classes, followed by Vaishyas (traders and merchants) and finally Shudras (labourers). Outside of this system are the oppressed, marginalised, and persecuted Dalits (also known as "Untouchables") and Adivasis (tribals). Over time, the system became increasingly rigid, and the emergence of jati led to further entrenchment, introducing thousands of new castes and sub-castes. With the arrival of Islamic rule, caste-like distinctions were formulated in certain Muslim communities, primarily in North India. The British Raj furthered the system, through census classifications and preferential treatment to Christians and people belonging to certain castes. Social unrest during the 1920s led to a change in this policy towards affirmative action.

Christianity is India's third-most followed religion with 28 million adherents, who make up 2.3 percent of the population as of the 2011 census. Christianity is the largest religion in parts of Northeast India, specifically in Nagaland, Mizoram, and Meghalaya. It is also a significant religion in Manipur, which is 41 percent Christian.

Nearly two-thirds (65 percent) of India's Christians are found in South India, Goa, & Mumbai (Bombay). The oldest known Christian group in North India are the Hindustani-speaking Bettiah Christians of Bihar, formed in the early 1700s through a Capuchin mission and under the patronage of Rajas (kings) in the Moghal Empire. The Church of North India and the Church of South India are a United Protestant denomination; which resulted from the evangelism/ ecumenism of Anglicans, Calvinists, Methodists and other Protestant groups who flourished in colonial India. Consequently, these churches are part of the worldwide Anglican Communion, World Communion of Reformed Churches, and World Methodist Council. Along with native Christians, small numbers of mixed Eurasian peoples such as Anglo-Indian, Luso-Indian, Franco-Indian and Armenian Indian Christians also existed in the subcontinent. Also, there is the Khrista Bhakta movement, who are unbaptised followers of Christ and St Mary, mainly among the Shudras and Dalits.

Manual scavenging is a term used mainly in India for "manually cleaning, carrying, disposing of, or otherwise handling, human excreta in an insanitary latrine or in an open drain or sewer or in a septic tank or a pit". Manual scavengers usually use hand tools such as buckets, brooms and shovels. The workers have to move the excreta, using brooms and tin plates, into baskets, which they carry to disposal locations sometimes several kilometers away. The practice of employing human labour for cleaning of sewers and septic tanks is also prevalent in Bangladesh and Pakistan. These sanitation workers, called "manual scavengers", rarely have any personal protective equipment. The work is regarded as a dehumanizing practice.

The occupation of sanitation work is intrinsically linked with caste in India. All kinds of cleaning are considered lowly and are assigned to people from the lowest rung of the social hierarchy. In the caste-based society, it is mainly the Dalits who work as sanitation workers - as manual scavengers, cleaners of drains, as garbage collectors and sweepers of roads. It was estimated in 2019 that between 40 and 60 percent of the six million households of Dalit sub-castes are engaged in sanitation work. The most common Dalit caste performing sanitation work is the Valmiki (also Balmiki) caste.

Bhimrao Ramji Ambedkar (Bhīmrāo Rāmjī Āmbēḍkar; 14 April 1891 – 6 December 1956) was an Indian jurist, economist, social reformer and political leader who chaired the committee that drafted the Constitution of India based on the debates of the Constituent Assembly of India and the first draft of Sir Benegal Narsing Rau. Ambedkar served as Law and Justice minister in the first cabinet of Jawaharlal Nehru. He later renounced Hinduism, converted to Buddhism and inspired the Dalit Buddhist movement.

After graduating from Elphinstone College, University of Bombay, Ambedkar studied economics at Columbia University and the London School of Economics, receiving doctorates in 1927 and 1923, respectively, and was among a handful of Indian students to have done so at either institution in the 1920s. During his time at the Columbia University, Ambedkar came under the influence of John Dewey and his philosophy of pragmatism. He also trained in the law at Gray's Inn, London. In his early career, he was an economist, professor, and lawyer. His later life was marked by his political activities; he became involved in campaigning and negotiations for partition, publishing journals, advocating political rights and social freedom for Dalits, and contributing to the establishment of the state of India. In 1956, he converted to Buddhism, initiating mass conversions of Dalits.