The Rig Veda (10:90) says that the gods created it by sacrificing the primal Purusha. His mouth became the Brahmin, his arms, Kshatriyas, his thighs, Vaishyas, and his feet became Shudras. And outside the pale of the varna system were the Untouchables, or Dalits.

Is caste system mentioned in Vedas?

There is no caste-system in Vedas — Agniveer. And hence, all humans should strive to be all the 4 Varnas to best of their capabilities, as per Vedic wisdom.

Is caste system part of Hinduism?

The caste system divides Hindus into four main categories - Brahmins, Kshatriyas, Vaishyas and the Shudras. Many believe that the groups originated from Brahma, the Hindu God of creation.