Here the importance is given to Jnana. The Upanishads speak of monism. All Vedas have Upanishads. Upa means nearby. Ni means devotion and shad means sitting. So the knowledge transmitted from Guru to Shisya when the latter sits near Guru is the Upanishad. It is also called the secret knowledge of Rahasya. The Upanishads appearing in the Vedas are of five types1.Mukya Upanishad-Principle Upanishad. Shankaracharya commented on this topic. There are 1126 of them. These Upanishads were created over hundreds of years. Among all these popular Upanishads, there are 108. Out of 108, 12 are the chief Upanishads-Aitareya, Brihadaranyaka, Chandogya, Katha, Kena, Kaivalya, Mundaka, Mandukya, Ishavasya, Prashna, Shvevatara, Taittiriya Upanishad2. Shaiva Upanishad-Lord Shiva is the supreme Lord.3.Vaishnava Upanishad-Vishnu is considered as the Lord Suprema.4. Sanyasa Upanishad - It is said what is the life of a renunciate or a sanyasi5. Yoga Upanishad - There are twenty in