Vedanta is a Hindu school based on Upanishads addressing relationship between self, ultimate reality, and phenomenal world. Three major sub-schools: Advaita, Vishishtadvaita, Dvaita.
Based on Upanishads, Bhagavad Gita, Brahma Sutras. Shankara systematized Advaita. Ramanuja developed Vishishtadvaita. Madhva articulated Dvaita.