A tribe is viewed developmentally, economically and historically as a social group existing outside of or before the development of states. A tribe is a group of distinct people who are dependent on their land for their livelihood, largely self-sufficient and not integrated into the national society. It is perhaps the term most readily understood and used by the general public to describe such communities. Stephen Corry defines tribal people as those who “have followed ways of life for many generations that are largely self-sufficient, and are clearly different from the mainstream and dominant society”
You can still find a lot of different Tribal people on the outskirts of cities & of course Villages, following their own rituals & norms, handed to through ages.
Information Source: Wikipedia