Vishnu is the god in the Hindu triumvirate (orTrimurti). Vishnu is the preserver and protector of the universe. His role is to return to the earth in troubled times and restore the balance of good and evil. Vishnu's worshippers, usually called Vaishnava, consider him the greatest god.Vaishnava worship only Vishnu. Vishnu monotheism is called Vaishnavism.