The Vedas (/ ˈ v eɪ d ə z, ˈ v iː - /; Sanskrit : वेद véda, "knowledge") are a large body of texts originating in ancient Indian subcontinent. 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 apauruṣeya , which means "not of a man, superhuman" and "impersonal, authorless".

Vedas are also called śruti ("what is heard") literature, distinguishing them from other religious texts, which are called smṛti ("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 the Mahabharata, the creation of Vedas is credited to Brahma. The Vedic hymns themselves assert that they were skillfully created by Rishis

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 (text discussing meditation, philosophy and spiritual knowledge). Some scholars add a fifth category – the Upasanas (worship).

The various Indian philosophies and denominations have taken differing positions on the Vedas. Schools of Indian philosophy which cite the Vedas as their scriptural authority are classified as "orthodox" (āstika). 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. Despite their differences, just like the texts of the śramaṇa traditions, the layers of texts in the Vedas discuss similar ideas and concepts.

The Sanskrit word véda"knowledge, wisdom" is derived from the root vid-"to know". This is reconstructed as being derived from the Proto-Indo-European root **u̯eid-*, meaning "see" or "know".

The noun is from Proto-Indo-European u̯eidosGreek (ϝ)εἶδος "aspect", "form". Not to be confused is the homonymous 1st and 3rd person singular perfect tense véda, cognate to Greek (ϝ)οἶδα (w)oida*"I know". Root cognates are Greek* ἰδέα English Latin

The Sanskrit term veda as a common noun means "knowledge", but can also be used to refer to fields of study unrelated to liturgy or ritual, e.g. in agada-veda"medical science", sasya-veda"science of agriculture" or sarpa-veda"science of snakes" (already found in the early Upanishads); durveda means "with evil knowledge, ignorant".

A related word Vedena appears in hymn 8.19.5 of the Rigveda. It was translated by Ralph T. H. Griffith as "ritual lore", as "studying the Veda" by the 14th century Indian scholar Sayana, as "bundle of grass" by Max Müller, and as "with the Veda" by H.H. Wilson.

Vedas are called Maṛai or Vaymoli in parts of South India. Marai literally means "hidden, a secret, mystery". In some south Indian communities such as Iyengars, the word Veda includes the Tamil writings of the Alvar saints, such as Divya Prabandham, for example Tiruvaymoli.

The Vedas are among the oldest sacred texts. The Samhitas date to roughly 1700–1100 BC, and the "circum-Vedic" texts, as well as the redaction of the Samhitas, date to c. 1000-500 BC, resulting in a Vedic period, spanning the mid 2nd to mid 1st millennium BC, or the Late Bronze Age and the Iron Age. The Vedic period reaches its peak only after the composition of the mantra texts, with the establishment of the various shakhas all over Northern India which annotated the mantra samhitas with Brahmana discussions of their meaning, and reaches its end in the age of Buddha and Panini and the rise of the Mahajanapadas (archaeologically, Northern Black Polished Ware). Michael Witzel gives a time span of c. 1500 to c. 500-400 BC. Witzel makes special reference to the Near Eastern Mitanni material of the 14th century BC the only epigraphic record of Indo-Aryan contemporary to the Rigvedic period. He gives 150 BC (Patañjali) as a terminus ante quem for all Vedic Sanskrit literature, and 1200 BC (the early Iron Age) as terminus post quem for the Atharvaveda.

Transmission of texts in the Vedic period was by oral tradition, preserved with precision with the help of elaborate mnemonic techniques. A literary tradition is traceable in post-Vedic times, after the rise of Buddhism in the Maurya period, perhaps earliest in the Kanva recension of the Yajurveda about the 1st century BC; however oral tradition of transmission remained active. Witzel suggests the possibility of written Vedic texts towards the end of 1st millennium BCE. Some scholars such as Jack Goody state that "the Vedas are not the product of an oral society", basing this view by comparing inconsistencies in the transmitted versions of literature from various oral societies such as the Greek, Serbia and other cultures, then noting that the Vedic literature is too consistent and vast to have been composed and transmitted orally across generations, without being written down. However, adds Goody, the Vedic texts likely involved both a written and oral tradition, calling it a "parallel products of a literate society".

Due to the ephemeral nature of the manuscript material (birch bark or palm leaves), surviving manuscripts rarely surpass an age of a few hundred years.

The Sampurnanand Sanskrit University has a Rigveda manuscript from the 14th century; however, there are a number of older Veda manuscripts in Nepal that are dated from the 11th century onwards.

The Vedas, Vedic rituals and its ancillary sciences called the Vedangas, were part of the curriculum at ancient universities such as at Taxila, Nalanda and Vikramashila.

The term "Vedic texts" is used in two distinct meanings:

The corpus of Vedic Sanskrit texts includes:

The Vedas (sruti) are different from Vedic era texts such as Shrauta Sutras and Gryha Sutras, which are smriti texts. Together, the Vedas and these Sutras form part of the Vedic Sanskrit corpus.

While production of Brahmanas and Aranyakas ceased with the end of the Vedic period, additional Upanishads were composed after the end of the Vedic period.

The Brahmanas, Aranyakas, and Upanishads, among other things, interpret and discuss the Samhitas in philosophical and metaphorical ways to explore abstract concepts such as the Absolute (Brahman), and the soul or the self (Atman), introducing Vedanta philosophy, one of the major trends of later Hinduism. In other parts, they show evolution of ideas, such as from actual sacrifice to symbolic sacrifice, and of spirituality in the Upanishads. This has inspired later Hindu scholars such as Adi Shankara to classify each Veda into karma-kanda (कर्म खण्ड, action/ritual-related sections) and jnana-kanda (ज्ञान खण्ड, knowledge/spirituality-related sections).

The texts considered "Vedic" in the sense of "corollaries of the Vedas" is less clearly defined, and may include numerous post-Vedic texts such as the later Upanishads and the Sutra literature. Texts not considered to be shruti are known as smriti (Sanskrit: smṛti; "the remembered"), or texts of remembered traditions. This indigenous system of categorization was adopted by Max Müller and, while it is subject to some debate, it is still widely used. As Axel Michaels explains:

The Upanishads are largely philosophical works, some in dialogue form. They are the foundation of Hindu philosophical thought and its diverse traditions. Of the Vedic corpus, they alone are widely known, and the central ideas of the Upanishads are at the spiritual core of Hindus.

The four Vedas were transmitted in various śākhā s (branches, schools). Each school likely represented an ancient community of a particular area, or kingdom. Each school followed its own canon. Multiple recensions are known for each of the Vedas. Thus, states Witzel as well as Renou, in the 2nd millennium BC, there was likely no canon of one broadly accepted Vedic texts, no Vedic “Scripture”, but only a canon of various texts accepted by each school. Some of these texts have survived, most lost or yet to be found. Rigveda that survives in modern times, for example, is in only one extremely well preserved school of Śåkalya, from a region called Videha, in modern north Bihar, south of Nepal. The Vedic canon in its entirety consists of texts from all the various Vedic schools taken together.

Each of the four Vedas were shared by the numerous schools, but revised, interpolated and adapted locally, in and after the Vedic period, giving rise to various recensions of the text.

Some texts were revised into the modern era, raising significant debate on parts of the text which are believed to have been corrupted at a later date.

The Vedas each have an Index or Anukramani, the principal work of this kind being the general Index or Sarvānukramaṇī.

Prodigous energy was expended by ancient Indian culture in ensuring that these texts were transmitted from generation to generation with inordinate fidelity.

For example, memorization of the sacred Vedas included up to eleven forms of recitation of the same text. The texts were subsequently "proof-read" by comparing the different recited versions. Forms of recitation included the jaṭā-pāṭha (literally "mesh recitation") in which every two adjacent words in the text were first recited in their original order, then repeated in the reverse order, and finally repeated again in the original order. That these methods have been effective, is testified to by the preservation of the most ancient Indian religious text, the Rigveda , as redacted into a single text during the Brahmana period, without any variant readings within that school.

The Vedas were likely written down for the first time around 500 BC.

However, all printed editions of the Vedas that survive in the modern times are likely the version existing in about the 16th century AD.

The canonical division of the Vedas is fourfold (turīya) viz.,

Of these, the first three were the principal original division, also called "trayī vidyā", that is, "the triple science" of reciting hymns (Rigveda), performing sacrifices (Yajurveda), and chanting songs (Samaveda). The Rigveda is the oldest work, which Witzel states are probably from the period of 1900 to 1100 BC. Witzel, also notes that it is the Vedic period itself, where incipient lists divide the Vedic texts into three (trayī) or four branches: Rig, Yajur, Sama and Atharva.

Each Veda has been subclassified into four major text types – the Samhitas (mantras and benedictions), the Aranyakas (text on rituals, ceremonies such as newborn baby's rites of passage, coming of age, marriages, retirement and cremation, sacrifices and symbolic-sacrifices), the Brahmanas (commentaries on rituals, ceremonies and sacrifices), and the Upanishads (text discussing meditation, philosophy and spiritual knowledge). The Upasanas (short ritual worship-related sections) are considered by some scholars as the fifth part. Witzel notes that the rituals, rites and ceremonies described in these ancient texts reconstruct to a large degree the Indo-European marriage rituals observed in a region spanning the Indian subcontinent, Persia and the European area, and some greater details are found in the Vedic era texts such as the Grhya Sūtras.

Only one version of the Rigveda is known to have survived into the modern era.

Several different versions of the Sama Veda and the Atharva Veda are known, and many different versions of the Yajur Veda have been found in different parts of South Asia.

The Rigveda Samhita is the oldest extant Indic text. It is a collection of 1,028 Vedic Sanskrit hymns and 10,600 verses in all, organized into ten books (Sanskrit: mandalas). The hymns are dedicated to Rigvedic deities.

The books were composed by poets from different priestly groups over a period of several centuries from roughly the second half of the 2nd millennium BC (the early Vedic period), starting with the Punjab (Sapta Sindhu) region of the northwest Indian subcontinent. The Rigveda is structured based on clear principles – the Veda begins with a small book addressed to Agni, Indra and other gods, all arranged according to decreasing total number of hymns in each deity collection; for each deity series the hymns progress from longer to shorter ones; yet, the number of hymns per book increases; finally, the meter too is systematically arranged from jagati and tristubh to anustubh and gayatri as the text progresses. In terms of substance, the nature of hymns shift from praise of deities in early books to Nasadiya Sukta with questions such as, "what is the origin of the universe?, do even gods know the answer?", the virtue of Dāna (charity) in society, and other metaphysical issues in its hymns.

There are similarities between the mythology, rituals and linguistics in Rigveda and those found in ancient central Asia, Iranian and Hindukush (Afghanistan) regions.

The Samaveda Samhita consists of 1549 stanzas, taken almost entirely (except for 75 mantras) from the Rigveda. The Samaveda samhita comprises two major parts. The first part include four melody collections (gāna, गान) and the second part three verse “books” (ārcika, आर्चिक). A melody in the song books corresponds to a verse in the arcika books. Just like Rigveda, the early sections of Samaveda typically begin with Agni and Indra hymns but shift to abstract, and their meters too shifts in a descending order. The later sections of the Samaveda have least deviation from substance of hymns they derive from Rigveda into songs.

In Samaveda, some of the Rigvedic verses are repeated more than once.

Including repetitions, there are a total of 1875 verses numbered in the Samaveda recension translated by Griffith.

Two major recensions have survived, the Kauthuma/Ranayaniya and the Jaiminiya.

Its purpose was liturgical, and they were the repertoire of the udgātṛ or "singer" priests.

The Yajurveda Samhita consists of prose mantras. It is a compilation of ritual offering formulas that were said by a priest while an individual performed ritual actions such as those before the yajna fire.

The earliest and most ancient layer of Yajurveda samhita includes about 1,875 verses, that are distinct yet borrow and build upon the foundation of verses in Rigveda. Unlike the Samaveda which is almost entirely based on Rigveda mantras and structured as songs, the Yajurveda samhitas are in prose and linguistically, they are different from earlier Vedic texts. The Yajur Veda has been the primary source of information about sacrifices during Vedic times and associated rituals.

There are two major groups of texts in this Veda: the "Black" (Krishna) and the "White" (Shukla). The term "black" implies "the un-arranged, motley collection" of verses in Yajurveda, in contrast to the "white" (well arranged) Yajurveda. The White Yajurveda separates the Samhita from its Brahmana (the Shatapatha Brahmana), the Black Yajurveda intersperses the Samhita with Brahmana commentary. Of the Black Yajurveda, texts from four major schools have survived (Maitrayani, Katha, Kapisthala-Katha, Taittiriya), while of the White Yajurveda, two (Kanva and Madhyandina). The youngest layer of Yajurveda text is not related to rituals nor sacrifice, it includes the largest collection of primary Upanishads, influential to various schools of Hindu philosophy.

The Artharvaveda Samhita is the text 'belonging to the Atharvan and Angirasa poets. It has about 760 hymns, and about 160 of the hymns are in common with the Rigveda. Most of the verses are metrical, but some sections are in prose. Two different versions of the text – the Paippalāda and the Śaunakīya – have survived into the modern times. The Atharvaveda was not considered as a Veda in the Vedic era, and was accepted as a Veda in late 1st millennium BC. It was compiled last, probably around 900 BC, although some of its material may go back to the time of the Rigveda, or earlier.

The Atharvaveda is sometimes called the "Veda of magical formulas", an epithet declared to be incorrect by other scholars.

The Samhita layer of the text likely represents a developing 2nd millennium BC tradition of magico-religious rites to address superstitious anxiety, spells to remove maladies believed to be caused by demons, and herbs- and nature-derived potions as medicine. The text, states Kenneth Zysk, is one of oldest surviving record of the evolutionary practices in religious medicine and reveals the "earliest forms of folk healing of Indo-European antiquity". Many books of the Atharvaveda Samhita are dedicated to rituals without magic, such as to philosophical speculations and to theosophy.

The Atharva veda has been a primary source for information about Vedic culture, the customs and beliefs, the aspirations and frustrations of everyday Vedic life, as well as those associated with kings and governance.

The text also includes hymns dealing with the two major rituals of passage – marriage and cremation. The Atharva Veda also dedicates significant portion of the text asking the meaning of a ritual.

The Brahmanas are commentaries, explanation of proper methods and meaning of Vedic Samhita rituals in the four Vedas.

They also incorporate myths, legends and in some cases philosophy.

Each regional Vedic shakha (school) has its own operating manual-like Brahmana text, most of which have been lost. A total of 19 Brahmana texts have survived into modern times: two associated with the Rigveda, six with the Yajurveda, ten with the Samaveda and one with the Atharvaveda. The oldest dated to about 900 BC, while the youngest Brahmanas (such as the Shatapatha Brahmana), were complete by about 700 BC. According to Jan Gonda, the final codification of the Brahmanas took place in pre-Buddhist times (ca. 600 BC).

The substance of the Brahmana text varies with each Veda.

For example, the first chapter of the Chandogya Brahmana, one of the oldest Brahmanas, includes eight ritual suktas (hymns) for the ceremony of marriage and rituals at the birth of a child. The first hymn is a recitation that accompanies offering a Yajna oblation to Agni (fire) on the occasion of a marriage, and the hymn prays for prosperity of the couple getting married. The second hymn wishes for their long life, kind relatives, and a numerous progeny. The third hymn is a mutual marriage pledge, between the bride and groom, by which the two bind themselves to each other. The sixth through last hymn of the first chapter in Chandogya Brahmana are ritual celebrations on the birth of a child, and wishes for health, wealth and prosperity with a profusion of cows and artha. However, these verses are incomplete expositions, and their complete context emerges only with the Samhita layer of text.

The Aranyakas layer of the Vedas include rituals, discussion of symbolic meta-rituals, as well as philosophical speculations.

Aranyakas, however, neither are homogeneous in content nor in structure. They are a medley of instructions and ideas, and some include chapters of Upanishads within them. Two theories have been proposed on the origin of the word Aranyakas. One theory holds that these texts were meant to be studied in a forest, while the other holds that the name came from these being the manuals of allegorical interpretation of sacrifices, for those in Vanaprastha (retired, forest-dwelling) stage of their life, according to the historic age-based Ashrama system of human life.

The Upanishads reflect the last composed layer of texts in the Vedas.

They are commonly referred to as Vedānta , variously interpreted to mean either the "last chapters, parts of the Vedas" or "the object, the highest purpose of the Veda". The concepts of Brahman (Ultimate Reality) and Ātman (Soul, Self) are central ideas in all the Upanishads, and "Know your Ātman" their thematic focus. The Upanishads are the foundation of Hindu philosophical thought and its diverse traditions. Of the Vedic corpus, they alone are widely known, and the central ideas of the Upanishads have influenced the diverse traditions of Hinduism.

Aranyakas are sometimes identified as karma-kanda (ritualistic section), while the Upanishads are identified as jnana-kanda (spirituality section). In an alternate classification, the early part of Vedas are called Samhitas and the commentary are called the Brahmanas which together are identified as the ceremonial karma-kanda, while Aranyakas and Upanishads are referred to as the jnana-kanda.

The Vedangas developed towards the end of the vedic period, around or after the middle of the 1st millennium BC.

These auxiliary fields of Vedic studies emerged because the language of the Vedas, composed centuries earlier, became too archaic to the people of that time.

The Vedangas were sciences that focused on helping understand and interpret the Vedas that had been composed many centuries earlier.

The six subjects of Vedanga are phonetics (Śikṣā), poetic meter (Chandas), grammar (Vyākaraṇa), etymology and linguistics (Nirukta), rituals and rites of passage (Kalpa), time keeping and astronomy (Jyotiṣa).

Vedangas developed as ancillary studies for the Vedas, but its insights into meters, structure of sound and language, grammar, linguistic analysis and other subjects influenced post-Vedic studies, arts, culture and various schools of Hindu philosophy. The Kalpa Vedanga studies, for example, gave rise to the Dharma-sutras, which later expanded into Dharma-shastras.

Pariśiṣṭa"supplement, appendix" is the term applied to various ancillary works of Vedic literature, dealing mainly with details of ritual and elaborations of the texts logically and chronologically prior to them: the Samhitas, Brahmanas, Aranyakas and Sutras. Naturally classified with the Veda to which each pertains, Parisista works exist for each of the four Vedas. However, only the literature associated with the Atharvaveda is extensive.

The term upaveda ("applied knowledge") is used in traditional literature to designate the subjects of certain technical works. Lists of what subjects are included in this class differ among sources. The Charanavyuha mentions four Upavedas:

Some post-Vedic texts, including the Mahabharata, the Natyasastra and certain Puranas, refer to themselves as the "fifth Veda". The earliest reference to such a "fifth Veda" is found in the Chandogya Upanishad in hymn 7.1.2.

"Divya Prabandha]]]]", for example Tiruvaymoli, is a term for canonical Tamil texts considered as Vernacular Veda by some South Indian Hindus.

Other texts such as the Bhagavad Gita or the Vedanta Sutras are considered shruti or "Vedic" by some Hindu denominations but not universally within Hinduism. The Bhakti movement, and Gaudiya Vaishnavism in particular extended the term veda to include the Sanskrit Epics and Vaishnavite devotional texts such as the Pancaratra.

The Puranas is a vast genre of encyclopedic Indian literature about a wide range of topics particularly myths, legends and other traditional lore. Several of these texts are named after major Hindu deities such as Vishnu, Shiva and Devi. There are 18 Maha Puranas (Great Puranas) and 18 Upa Puranas (Minor Puranas), with over 400,000 verses.

The Puranas have been influential in the Hindu culture. They are considered Vaidika (congruent with Vedic literature). The Bhagavata Purana has been among the most celebrated and popular text in the Puranic genre, and is of non-dualistic tenor. The Puranic literature wove with the Bhakti movement in India, and both Dvaita and Advaita scholars have commented on the underlying Vedanta themes in the Maha Puranas.

The study of Sanskrit in the West began in the 17th century.

In the early 19th century, Arthur Schopenhauer drew attention to Vedic texts, specifically the Upanishads. The importance of Vedic Sanskrit for Indo-European studies was also recognized in the early 19th century. English translations of the Samhitas were published in the later 19th century, in the Sacred Books of the East series edited by Müller between 1879 and 1910. Ralph T. H. Griffith also presented English translations of the four Samhitas, published 1889 to 1899.

Voltaire regarded Vedas to be exceptional, he remarked that:

Rigveda manuscripts were selected for inscription in UNESCO's Memory of the World Register in 2007.