Four Vedas

The Vedas (/'ve?d?z, 'vi?-/;Sanskrit: ??? veda, "knowledge") are a large body of religious texts originating in ancient India. Composed in Vedic Sanskrit, the texts constitute the oldest layer of Sanskrit literature and the oldest scriptures of Hinduism. Hindus consider the Vedas to be apauru?eya, which means "not of a man, superhuman"[web 1] and "impersonal, authorless". Vedas are also called sruti ("what is heard") literature, distinguishing them from other religious texts, which are called sm?ti ("what is remembered").
The Veda, for orthodox Indian theologians, are considered revelations seen by ancient sages after intense meditation, and texts that have been more carefully preserved since ancient times. In the Hindu Epic Mahabharata, the creation of Vedas is credited to Brahma. The Vedic hymns themselves assert that they were skillfully created by Rishis (sages), after inspired creativity, just as a carpenter builds a chariot.
According to tradition, Vyasa is the compiler of the Vedas, who arranged the four kinds of mantras into four Samhitas (Collections). There are four Vedas: the Rigveda, the Yajurveda, the Samaveda and the Atharvaveda. Each Veda has been subclassified into four major text types - the Samhitas (mantras and benedictions), the Aranyakas (text on rituals, ceremonies, sacrifices and symbolic-sacrifices), the Brahmanas (commentaries on rituals, ceremonies and sacrifices), and the Upanishads (texts discussing meditation, philosophy and spiritual knowledge).
Some scholars add a fifth category - the Upasanas (worship) Despite their differences, just like the texts of the srama?a traditions, the layers of texts in the Vedas discuss similar ideas and concepts. The various Indian philosophies and Hindu denominations have taken differing positions on the Vedas; schools of Indian philosophy which cite the Vedas as their scriptural authority are classified as "orthodox" (astika).
Other srama?a traditions, such as Lokayata, Carvaka, Ajivika, Buddhism and Jainism, which did not regard the Vedas as authorities, are referred to as "heterodox" or "non-orthodox" (nastika) schools]