The Upanishads are a collection of texts of religious and philosophical nature, written in India probably between c. 800 BCE and c. 500 BCE, during a time when Indian society started to question the traditional Vedic religious order.
Upanishad, also spelled Upanisad, Sanskrit Upaniṣad (“Connection”), one of four genres of texts that together constitute each of the Vedas, the sacred scriptures of most Hindu traditions. Each of the four Vedas—the Rigveda, Yajurveda, Samaveda, and Atharvaveda—consists of a Samhita (a “collection” of hymns or sacred formulas); a liturgical prose exposition called a Brahmana; and two appendices to the Brahmana—an Aranyaka (“Book of the Wilderness”), which contains esoteric doctrines meant to be studied by the initiated in the forest or some other remote place, and an Upanishad, which speculates about the ontological connection between humanity and the cosmos.
