Caste—a division of people into a hierarchy of communities—is believed to have been started by the Aryans in order to achieve a social order in ancient India. This caste system comprised four broad categories—Brahmin, Kshatriya, Vaishya, Shudra. While modern Indian society does not adhere to the caste system, discrimination over caste still exists and can sometimes lead to clashes and community tension. To protect the welfare of the underprivileged members of society, whom the government calls the ‘backward classes’ or ‘scheduled castes’, the Indian government has set up a special division in the Ministry of Welfare to look after their needs. It has also adopted a policy of positive discrimination towards these people, as well as towards the aboriginal tribals it calls the ‘scheduled tribes’. A reservation policy, whereby a small percentage of seats are reserved for these underprivileged in educational institutions and government jobs, has led to resentment and protests from the rest of Indian society.