Within it's eight chapters, the "Chandogya Upanishad" describes many aspects of Hindu philosophy including concepts such as the chanting of Om, good and evil, space, the universe as a whole, the Soul and Self, oneness with the world and Brahman. It is a poetic text with a metered structure, focusing on song, language and chanting.
Much of the same content within the Chadogya Upanishad is also found within the "Brihadaranyaka Upanishad," though not in poetic form.
The exact date of composition is unclear and disputed. Most scholars believe that the text was composed before the start of Buddhism. Many of the philosophical principles outlined in the "Chandogya Upanishad" are similar to yoga philosophy.