The Upanishads are a collection of ancient Indian philosophical texts that were composed by various authors over a span of centuries. The exact authors of individual Upanishads are often unknown or attributed to obscure sages and philosophers. Some well-known Upanishads include the Brihadaranyaka Upanishad, Chandogya Upanishad, Katha Upanishad, and Mandukya Upanishad.
