Roughly 8.6 per cent of India's population is made up of "Scheduled Tribes" (STs), traditional tribal communities.
[citation needed] According to the 2011 census of India, about 7.9 million (7,937,734) out of 1.21 billion people did not adhere to any of the subcontinent's main religious communities of Hinduism, Islam, Christianity, Sikhism, Buddhism, or Jainism.
They have their own way of life to maintain all privileges in matters connected with marriage and succession, according to their customary tribal faith.
[5] The various tribes can be categorised into different major linguistic groupings, such as Indo-Aryan, Dravidian, Austroasiatic, Tibeto-Burman, and Andamanese.
The small hunting-and-gathering groups in the union territory of the Andaman and Nicobar Islands have been under severe pressure of cultural assimilation.