Caste is the universal experience of all Hindus. Within five centuries of the Aryan invasion, the caste system was well developed. In this segment of the lecture David Shenk talks about four principle castes: Brahman, the priestly caste; Kshatriya, the warrior and ruler caste; Vaisya, the merchant caste and Sudra, the servant caste. The social order as expressed in caste is ontocratic. Watch this video to understand why one cannot critique the caste system and why it is important to learn what Mukti and Moksha mean.