South Asia, constituting mainly the Indian sub-continent, is a panorama of social diversities, racial differences and rich cultural heritage. However many facets of history, race and culture of this area are still relatively unexplored. Debates and doubts centering around the autochthonous status of the early settlers continue - it is very difficult to ascertain how human groups and settlements were formed in the pre-historic times, whether they were the original inhabitants or migrated from some other place and if they migrated, which route did they take. However, the infiltration and admixture of new racial and cultural elements, from time to time, have made the Indian population more diverse and heterogeneous.