Explanation:

The word Upanishad means to sit down near someone and denotes a student sitting near his guru to learn. Eventually the word began to be used for the secret knowledge imparted by the guru to his selected pupils. A number of treatises were prepared, first orally and then in writing, and were called by the same name of Upanishad. Today Upanishads specify philosophical knowledge and spiritual learning. The main motto of the Upanishads is “Knowledge Awards Salvation” Upanishads are called Vedanta (the end of the Veda) firstly, because they denote the last phase of the Vedic period and secondly, because they reveal the final aim of the Veda.