Brahman is the Sanskrit word that is sometimes translated as God; an inaccurate rendering, for there is nothing anthropomorphic about Brahman. It is not a God sitting up in heaven and looking down and judging us poor humans. Brahman cannot be described in words, for it is beyond words, and beyond human concept. It is omniscient, omnipresent, omnipotent; it is everlasting.
The Upanishads describe Brahman as “the nature of truth, knowledge and infinity." It is the ultimate reality, independent of all phenomena and at the same time the source and ultimate ground of all phenomena. It is not only the primary cause of all material reality: it IS that reality, the essential substance of all that exists in time and space, the microcosm and the macrocosm, from the tiniest particle of an atom to the largest bodies in the Universe. Brahman is all there is; hidden from our eyes only through illusion and false identity.