Veda means “wisdom” and specifically refers to the sacred wisdom of the four Vedic collections: Rig, Sama, Yajur, and Atharva Vedas. Associated with each of these Vedas is literature called Brahmanas, which are concerned especially with rituals, and Upanishads, which explore a deeper philosophical understanding of the universe. In its broadest sense, the term Veda refers to the wisdom and authority to which Hindus turn.