Definition: The caste system refers to the system of stratification of Hinduism. Although its origins are not known and are complicated by the Aryan controversy, it is commonly thought to come from the Hindu scriptures where there are 4 "varnas" or caste clusters. The four caste clusters do not include the so-called untouchables. The top three varnas were Aryans. The four varnas are the Brahmins (priests, teachers), Kshatriyas (kings, warriors), Vaishyas (merchants, artisans), and Shudras (laborers, peasants). There is a color connected with the four varnas that may or may not correspond with skin color. The highest caste is white and the lowest black.
Source: The Caste System in Hinduism
Hinduism - Social Organization
