Chandogya Upanishad is as old as Brhadaranyaka Upanishad and together they rank among the oldest Upanishads. Chandogya Upanishad was written on the Vedic Brahmana period about ninth to eighth century BC. Chandogya Upanishad is associated with Samveda. It is ranked ninth in the Muktika canon of hundred and eight Upanishadas.
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Chandogya Upanishad is the part of Chandogya Brahaman that contains ten chapters. The first two chapters of Chandogya Brahmana deal with the rituals of sacrifice and worship. The rest eight chapters constitute Chandogya Upanishad. Chandogya Upanishad is the ancient and authentic source of principal fundamentals of Vedanta philosophy. In Brahma Sutras a number of references are made to this Chandogya Upanishad, which indicates its special significance in Vedantic philosophy. The speciality of Chandogya Upanishad is important Upasanas of Meditation like Dahara Vidya, Shandilya Vidya etc.
It is one of the largest Upanishadic compilations, and has eight Prapathakas (literally lectures, chapters), each with many volumes, and each volume contains many verses. The volumes are a motley collection of stories and themes. As part of the poetic and chants-focussed Samaveda, the broad unifying theme of the Upanishad is the importance of speech, language, song and chants to man's quest for knowledge and salvation, to metaphysical premises and questions, as well as to rituals.
