Consciousness is at once the most familiar and the most puzzling of facts. Modern science studies its correlates in the brain; the contemplative traditions study it directly. Many hold it to be not a product of the world but its ground: the Upaniṣads call Brahman consciousness, and Yogācāra and Kashmir Śaivism make mind the basis of all.
Consciousness
Awareness itself: the fact of experience, in which anything at all appears.