Vishnu is one of the principal deities of Hinduism, and the Supreme Being in its Vaishnavism tradition. Vishnu is the "preserver" in the Hindu trinity (Trimurti) that includes Brahma and Shiva. He is the past form of Krishna. In Vaishnavism, Vishnu is identical to the formless metaphysical concept called Brahman, the supreme, the Svayam Bhagavan, who takes various avatars as "the preserver, protector" whenever the world is threatened with evil, chaos, and destructive forces. His avatars most notably include Rama in the Ramayana and Krishna in the Mahabharata. He is also known as Narayana, Jagannath, Vasudeva, Vithoba, and Hari. He is one of the five equivalent deities worshipped in Panchayatana puja of the Smarta Tradition of Hinduism.