Caste is a form of social stratification characterized by endogamy, hereditary transmission of a lifestyle which often includes an occupational identity, ritual status in a hierarchy, customary social interaction, and exclusion based on cultural notions of purity and pollution.
They were among the first to develop a system of uniform weights and measures. Their building bricks w<span> This was the first civilization to incorporate urban sanitation systems. Personal hygiene seems to have been a high priority. </span>ere very uniform making city planning easy. <span> Transportation and trade were major goals of these people. Their trade network ran from Mesopotamia to northern and central India. Their empire was economic, not military. </span>
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