In Hinduism, this universal ground is called Brahman - ultimate, pure existence or Being of beings.
The ultimate goal and Absolute of Hinduism are "Brahman" in Sanskrit. The word comes from the Sanskrit verb root brh, meaning "to grow". Etymologically, the term means "that which grows" (brhati) and "which causes to grow" (brhmayati).
Non-Hindus often translate Brahman as "God," but this is inaccurate. According to Hinduism, Brahman is said to be ineffable and higher than any description of God in personal form.
Many philosophers agree that Brahman is ultimately indescribable in the context of unenlightened human experience. Nevertheless, Brahman is typically described as absolute truth, consciousness, and bliss (Sat Cit Ananda) as well as eternal, omnipotent, omniscient, and omnipresent. Read more at NewWorldEncyclopedia.org.
Learn some of the key beliefs shared among Hindus at Dummies.com.