India's caste system is one of the world's longest surviving social hierarchies, dividing society into rigid hierarchical groups based on religious purity and birth. The system originated around 1500 BC when fair-skinned Aryan invaders dominated the native Dravidian population, establishing themselves at the top of the social order as priests. Today, the caste system allocates statuses and occupations, and though now illegal, still influences social discrimination and divisions, with the "untouchable" Dalits facing significant disadvantages and barriers. The government has implemented affirmative action policies like quotas to promote greater equality, but caste tensions and inequalities persist in many aspects of Indian society.