Caste system in India

The Indian caste system describes the system of social stratification and social restrictions in India in which social classes are defined by thousands of endogamous hereditary groups, often termed jātis or castes. Within a jāti, there exist exogamous groups known as gotras, the lineage or clan of an individual. In a handful of sub-castes such as Shakadvipi, endogamy within a gotra is permitted and alternative mechanisms of restricting endogamy are used (e.g. banning endogamy within a surname).

The Indian caste system involves four castes and outcasted social groups. Although generally identified with Hinduism, the caste system was also observed among followers of other religions in the Indian subcontinent, including some groups of Muslims and Christians. Caste barriers have mostly broken down in large cities, though they persist in rural areas of the country, where 72% of India's population resides.

While the Hindu scriptures do endorse the caste system, none of them endorse caste-based discrimination. Furthermore, the Indian Constitution has outlawed caste-based discrimination, in keeping with the secular, democratic principles that founded the nation. Nevertheless, the caste system, in various forms, continues to survive in modern India because of a combination of political factors and social beliefs and behavior.

According to the ancient Hindu scriptures, there are four "varnas". The Bhagavad Gita says varnas are decided based on Guna and Karma. Manusmriti and some other shastras name four varnas:
the Brahmins (warriors, merchants and priests)
the Kshatriyas (Rulers, nobles, and warriors)
the Vaishyas (Bankers and business)
the Shudras (Artisans and laborers).