The document summarizes the caste system of ancient India, which divided Indian society into five hierarchical groups according to occupation and social status. The Aryan invaders established this system, with Brahmins as priests and teachers at the top, followed by Kshatriyas as warriors, Vaishyas as traders and merchants, Sudras as laborers, and Harijans as untouchables below all other castes. People were born into their caste and it was impossible to change, with castes strictly governing relationships and interactions between groups.