There are four Vedas: the Rigveda, the Yajurveda, the Samaveda and the Atharvaveda.[7][8] Each Veda has four subdivisions – 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).[7][9][10] Some scholars add a fifth category – the Upasanas (worship).[11][12] The texts of the Upanishads discuss ideas akin to the heterodox sramana-traditions.[13]

Vedas are śruti ("what is heard"),[14] distinguishing them from other religious texts, which are called smṛti ("what is remembered"). Hindus consider the Vedas to be apauruṣeya, which means "not of a man, superhuman"[15] and "impersonal, authorless,"[16][17][18] revelations of sacred sounds and texts heard by ancient sages after intense meditation.[19][20]

The Vedas have been orally transmitted since the 2nd millennium BCE with the help of elaborate mnemonic techniques.[21][22][23] The mantras, the oldest part of the Vedas, are recited in the modern age for their phonology rather than the semantics, and are considered to be "primordial rhythms of creation", preceding the forms to which they refer.[24] By reciting them the cosmos is regenerated, "by enlivening and nourishing the forms of creation at their base."[24]

The various Indian philosophies and Hindu denominations have taken differing positions on the Vedas; schools of Indian philosophy which acknowledge the primal authority of the Vedas are classified as "orthodox" (āstika).[note 2] Other śramaṇa 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" (nāstika) schools.[13][25]

Etymology and usage
Vedic texts
Chronology, transmission and interpretation
Vedic schools or recensions
Four Vedas
Post-Vedic literature
Authority of the Vedas
Western Indology
See also
Notes
References
Sources
Further reading
External links

Rig Veda is the oldest Veda which was likely to composed in 1700-1100 BCE