Mahavishnu (Sanskrit: महाविष्णु, romanized: Mahāviṣṇu, lit. 'Great Vishnu') is an aspect of Vishnu, the principal deity in Vaishnavism. In his capacity as Mahavishnu, the deity is known as the Supreme Purusha, the absolute protector and sustainer of the universe, the one who is beyond human comprehension, and all attributes.
The term Mahavishnu refers to the absolute truth, Brahman (impersonal invisible aspect) then as Paramatma (Aspect beyond the understanding of human soul), and finally as Sarvatma (incarnating for bringing perfection). Bhakti (loving devotion) is offered to Sarvatman (Krishna or Rama avatars or incarnations of Vishnu, Narayana bringing both peace and perfection of the living beings). In this way, bhakti surpasses even yoga, which is aimed at the Supersoul, Paramatman. Mahavishnu is the Supersoul of all living beings (jivatmas) in all material universes. Karanodaksayi Vishnu is understood to be Sankarsana (form) of the Chatur-vyuha of Narayaņa. It is also often used interchangeably with Vishnu to indicate reverence, as the prefix "Maha" in Vishnu indicates the greatness and the vastness of Narayana. All the deities that bear material form like Shiva and Brahma are considered as a grain of sand in the ocean of Mahavishnu's Vishvarupam.