Tribes are classified into four categories on the basis of which of the following?

Ethnicity Language Region Religion

Language

In terms of language, tribes are categorised into four categories. Two of them, Indo-Aryan and Dravidian, are shared by the rest of the Indian population as well, and tribes account for only about 1% of the former and about 3% of the latter. The other two language groups, the Austric and Tibeto-Burman, are primarily spoken by tribals, who account for all of the first and over 80% of the second group. In physical-racial terms, tribes are classified under the Negrito, Australoid, Mongoloid, Dravidian and Aryan categories. The last two are again shared with the rest of the population of India.