Question

How do know about the tribals

Answer 1

In anthropology, a tribe is a human social group. Exact definitions of what constitutes a tribe vary among anthropologists, and the term is itself considered controversial in academic circles in part due to its association with colonialism. 

Answer 2

a tribals can be defined as people belonging to the same race , inhabiting a specific regions of the country,using same language and practicing the same culture and religion.