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Jatis (the word literally means "births") comprise the subcastes found within the four major castes, or varnas, of the Indian caste system. Each jati typically has an association with a traditional job function in Hindu society, although religious beliefs (e.g. Sri Vaishnavism or Laws of Manu, c. 200, codified the social relations between caste groups.
It is believed that the jati system ossified from an original occupation-based classification into a hereditary classification with attendant rules forbidding marriage between jatis.