Varna refers to the four main social classes in ancient Indian society, which are a foundational concept in the development of Hinduism and the caste system. These classes—Brahmins (priests and teachers), Kshatriyas (warriors and rulers), Vaishyas (traders and agriculturists), and Shudras (laborers and service providers)—structured social organization and influenced individuals' roles in society. The varna system contributed to the emergence of a rigid hierarchy that shaped personal identity, societal interactions, and religious practices in ancient India.