Caste: A social stratification system in which people are born into a social standing that largely determines their life options, with little mobility between castes.
Brahmin: The highest caste in the Hindu varna system, traditionally associated with priests, scholars, and religious leaders.
Untouchability: A social practice in some regions of the Indian subcontinent in which members of the lower castes are considered ritually impure and are shunned, segregated, and discriminated against.