Vishishtadvaita (IAST Viśiṣṭādvaita; Sanskrit: विशिष्टाद्वैत) is one of the most popular schools of the Vedanta school of Hindu philosophy. Vedanta literally means the end of the Vedas. VishishtAdvaita (literally "Advaita with uniqueness; qualifications") is a non-dualistic school of Vedanta philosophy. It is non-dualism of the qualified whole, in which Brahman alone exists, but is characterized by multiplicity. It can be described as qualified monism or qualified non-dualism or attributive monism. It is a school of Vedanta philosophy which believes in all diversity subsuming to an underlying unity.
Ramanuja, the 11-12th century philosopher and the main proponent of Vishishtadvaita philosophy contends that the Prasthanatrayi ("The three courses"), namely the Upanishads, the Bhagavad Gita, and the Brahma Sutras are to be interpreted in a way that shows this unity in diversity, for any other way would violate their consistency. Vedanta Desika defines Vishishtadvaita using the statement, Asesha Chit-Achit Prakaaram Brahmaikameva Tatvam : Brahman, as qualified by the sentient and insentient modes (or attributes), is the only reality.