Untouchability is an Indian phenomenon based on degrees of pollution and purity probably unrelated to race. Sometime around the fifth century CE castes evolved that were ranked below the fourfold varna (caste) system of Brahman (priest), Kshatriya...

In the Indian caste system, a Dalit, often called an untouchable, or an outcaste, is a person who according to traditional Hindu belief does not have any "varnas". Varna refers to the Hindu belief that most humans were supposedly created from different...