Vishishtadvaita
Vishishtadvaita Vedanta (IAST Viśiṣṭādvaita Vedānta; Sanskrit: विशिष्टाद्वैत) is a sub-school of the Vedānta (literally, end or the goal of Knowledge, Sanskrit) school of Hindu philosophy, the other major sub-schools of Vedānta being Advaita, Dvaita, and Achintya-Bheda-Abheda. 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 characterised by multiplicity. It can be described as qualified monism/nondualism or attributive monism.
Asesha Chit-Achit Prakaaram Brahmaikameva Tatvam - Brahman as qualified by the sentient and insentient modes (aspects or attributes) is the only reality.
It is a school of Vedanta philosophy which believes in all diversity subsuming to an underlying unity. Ramanuja, the main proponent of Visishtadvaita philosophy contends that the Prasthana Traya ("The three courses") i.e. Upanişads, Bhagavad Gītā, and Brahma Sūtras are to be interpreted in way that shows this unity in diversity, for any other way would violate their consistency.
Read more about Vishishtadvaita: Philosophers, Key Principles of Vishishtadvaita, Ethics, Interpretation of Mahāvākyas, Purpose of Human Existence, Thenkalai and Vadakalai Schools of Thought, Traditions Following Vishshtadvaita, Comparison With Western Non-dualism, Conclusion