Upanishads (Sanskrit: उपनिषद्, Upaniṣad IAST) are ancient Indian treatises of a religious and philosophical nature. They are part of the Vedas and belong to the sacred scriptures of Hinduism in the category of shruti. They mainly discuss philosophy, meditation and the nature of God. It is believed that the Upanishads set out the main essence of the Vedas - therefore they are also called “Vedanta” (the end, completion of the Vedas) and they are the basis of Vedantic Hinduism. The Upanishads mainly describe the impersonal Brahman.