The word "Hindu" originates as a geographical exonym derived from the Sanskrit term Sindhu, the historic local name for the Indus River in the northwestern part of the Indian subcontinent. In the first millennium BCE, Old Persian speakers referred to the lands and peoples beyond the river as Hindu, a designation that passed into ancient Greek as Indoi and eventually yielded the English words "India" and "Indian". Following the arrival of Turkic and Central Asian Muslim rulers in the medieval era, the term was increasingly used to distinguish the indigenous, non-Muslim populations of the subcontinent from newcomers. By the 16th century, residents of India had begun using the term in vernacular literature to differentiate their own cultural and religious communities from those of the ruling Turks.

The abstract noun "Hinduism" was coined in the early 19th century by British writers, colonial administrators, and Christian missionaries seeking a single category for the varied religious, philosophical, and social customs native to India. The term gained widespread currency in Western scholarship after the publication of the 1877 book Hinduism by the Oxford Sanskritist Sir Monier Monier-Williams. Prior to this colonial systematization, adherents generally identified themselves by specific devotional lineages (sampradayas), philosophical schools, regional customs, or social castes rather than a single unified label.

In response to Western categorization, 19th- and 20th-century Hindu thinkers popularized the ancient Sanskrit expression Sanatana Dharma ("eternal dharma" or "eternal way") as an indigenous designation. Because the tradition encompasses theological positions ranging from strict monism and monotheism to polytheism, panentheism, and even ritualistic atheism, scholars of religion often describe Hinduism not as a monolithic creed, but as a polycentric family of interrelated traditions bound by common texts, sacred geography, and ritual grammar.

The historical roots of Hinduism lie in the intersection of two ancient cultural streams: the Bronze Age Indus Valley Civilization (c. 2600–1900 BCE) and the Vedic culture introduced by Indo-Aryan migrations into northern India between roughly 1900 and 1400 BCE.¹⁴ Archaeological excavations at Indus Valley sites such as Mohenjo-daro and Harappa have uncovered ritual bathing structures, terracotta figurines interpreted as mother goddesses, fire altars, and steatite seals depicting a seated, horned figure surrounded by animals, which some scholars compare to later iconography of the god Shiva. The Vedic period (c. 1500–500 BCE) established the liturgical foundation of the religion through the oral composition of the Vedas in Vedic Sanskrit. Early Vedic religion centered on yajna—elaborate fire sacrifices performed by specialized priests to cosmic deities such as Indra, Agni (fire), and Varuna.

Between roughly 800 and 200 BCE, a period of urbanization in the Gangetic plain coincided with a major philosophical shift.¹⁵ The composition of the Upanishads moved the focus of religious inquiry away from external sacrificial ritual toward internal contemplation, introducing foundational doctrines of ultimate reality (Brahman), the inner self (atman), transmigration, and spiritual liberation. During the same era, ascetic reform movements known as the Sramana traditions—most notably Buddhism and Jainism—rejected the authority of the Vedas and the hereditary priesthood, challenging orthodox Vedic Brahmanism to adapt.¹⁶

What historians call the "Hindu synthesis" emerged between roughly 200 BCE and 500 CE, spanning the composition of the great Sanskrit epics and the early Puranas, and reaching a classical zenith under the Gupta Empire (c. 320–650 CE).¹⁷ During this era, Vedic orthodoxy absorbed local deities, folk traditions, and ascetic ethics, while temple worship and devotional theism centered on Vishnu, Shiva, and Devi replaced open-air fire altars as the primary mode of religious life. From the 4th century CE onward, maritime trade and royal patronage carried Hindu statecraft, Sanskrit literature, and temple architecture across Southeast Asia, leaving lasting monuments such as Angkor Wat in Cambodia and Prambanan in Java.

Beginning in the 6th century CE in the Tamil-speaking region of southern India, the Bhakti (devotional) movement reshaped the religion.¹⁸ Led initially by the Vaishnava Alvar and Shaiva Nayanar poet-saints, and sweeping across northern and eastern India between the 15th and 17th centuries through figures such as Kabir, Mirabai, Surdas, and Ravidas, the movement emphasized passionate, personal love for a chosen deity over ritual formalism and caste hierarchy. Composing hymns in regional vernacular languages rather than Sanskrit, Bhakti poets made spiritual salvation accessible to women and marginalized castes.¹⁹

Under British colonial rule in the 18th and 19th centuries, contact with Western political thought and Christian missionary critiques prompted the rise of Hindu reform and revival movements.²⁰²¹ In 1828, Raja Ram Mohan Roy founded the Brahmo Samaj in Kolkata, advocating monotheism and campaigning against social practices such as sati (widow immolation) and child marriage.²² In 1875, Swami Dayananda Saraswati established the Arya Samaj, which rejected image worship and caste by birth while calling for a return to the authority of the Vedas. Toward the end of the century, the mystic Ramakrishna and his disciple Swami Vivekananda—who introduced Advaita Vedanta to Western audiences at the 1893 World's Parliament of Religions in Chicago and founded the Ramakrishna Mission in 1897—articulated a universalist Neo-Vedanta that emphasized social service and played a formative role in the Indian independence movement alongside the religious ethics of Mahatma Gandhi.

Despite the absence of a single mandatory creed, most Hindu traditions share a metaphysical framework centered on the concepts of Brahman and atman.²³ Brahman is understood as the uncreated, infinite, and eternal ultimate reality—the supreme cosmic principle that serves as the source, foundation, and goal of all existence. Depending on the theological school, Brahman is viewed either as Nirguna (without attributes, formless and transcendent) or Saguna (with attributes, manifesting as a personal, loving creator and sustainer of the universe, often termed Ishvara). Within every living being resides the atman, the eternal, uncreated true self or soul.

The trajectory of the atman is governed by samsara, the beginningless cycle of birth, death, and reincarnation through which the soul migrates from one physical body to another. Movement within samsara is regulated by karma (literally "action"), a moral law of cause and effect whereby a person's intentional thoughts, words, and deeds determine the conditions of their future existences. The ultimate spiritual aim in Hinduism is moksha—release or liberation from the cycle of rebirth and the suffering caused by spiritual ignorance (avidya).²⁴

Within the realm of worldly life, Hindu ethics organize human endeavor around the four purusharthas (proper aims of human life).²⁵ The first is dharma, which encompasses righteous conduct, moral duty, social responsibility, and harmony with cosmic order. The second is artha, the pursuit of material prosperity, economic security, and livelihood. The third is kama, the fulfillment of aesthetic pleasure, emotional love, and sensory desire. The fourth and final aim is moksha. To achieve moksha, scriptures such as the Bhagavad Gita outline multiple spiritual paths (margas or yogas) suited to different human temperaments: karma yoga (the path of selfless action performed without attachment to results), bhakti yoga (the path of loving devotion to a personal god), jnana yoga (the path of philosophical inquiry and discernment), and raja yoga (the path of meditative and psychophysical discipline).²⁶

Hinduism possesses a vast corpus of sacred literature composed primarily in Sanskrit, alongside major devotional works in Tamil, Hindi, Marathi, Bengali, and other regional languages.²⁸ Traditional scholarship divides Sanskrit scriptures into two overarching categories based on their origin and authority: Shruti and Smriti.

Shruti ("that which is heard") comprises texts regarded as authorless (apaurusheya), eternal revelations perceived directly by ancient sages (rishis) in states of deep meditation and transmitted orally with strict phonetic precision for centuries before being committed to writing. The core of Shruti is the four Vedas: the Rigveda (the oldest, containing over a thousand hymns to the deities), the Yajurveda (liturgical prose and formulas for sacrificial rites), the Samaveda (chants and melodies derived largely from the Rigveda), and the Atharvaveda (incantations, healing charms, and speculative hymns for daily life). Each Veda is further subdivided into four layers: the Samhitas (core mantras and hymns), the Brahmanas (prose commentaries explaining ritual mechanics), the Aranyakas ("forest treatises" offering esoteric ritual interpretations), and the Upanishads (philosophical dialogues exploring the nature of reality and the self, of which roughly thirteen principal texts form the foundation of Vedanta).

Smriti ("that which is remembered") consists of texts attributed to human authors—typically revered sages—that interpret, narrative, and apply Vedic truths for the wider population. While secondary in formal authority to the Vedas, Smriti literature exercises a far greater influence on everyday Hindu belief and practice. The most prominent Smriti works are the two Sanskrit epics (Itihasas): the Ramayana, attributed to the poet Valmiki, which recounts the exile and righteous rule of Prince Rama and the rescue of his wife Sita from the demon king Ravana; and the Mahabharata, attributed to Vyasa, a massive narrative of a dynastic war between the Pandava and Kaurava cousins. Embedded within the sixth book of the Mahabharata is the Bhagavad Gita ("Song of the Lord"), a 700-verse philosophical dialogue in which Krishna counsels the warrior Arjuna on duty, action, and devotion on the eve of battle.

Other major Smriti collections include the eighteen Mahapuranas (such as the Bhagavata Purana and Shiva Purana), which compile vast mythologies, cosmologies, genealogies, and temple lore; the Dharmashastras (including the Manusmriti and Yajnavalkya Smriti), which codify ancient social norms, ethics, and jurisprudence; and the Agamas and Tantras, sectarian scriptures that govern temple architecture, deity consecration, and esoteric meditative practices across Vaishnava, Shaiva, and Shakta lineages.

While outsiders have frequently characterized Hinduism as polytheistic due to its vast pantheon of gods and goddesses (devas and devis), many Hindus and scholars describe the tradition as henotheistic, monotheistic, or polymorphic monism: the belief that a single supreme reality manifests in countless divine forms to suit the varied spiritual needs of worshippers. An adherent commonly selects a personal patron deity (ishta-devata) as the primary focus of devotion while continuing to respect and venerate other deities. Classical Puranic mythology groups the cosmic functions of creation, preservation, and destruction into the Trimurti (triad) of Brahma the creator, Vishnu the preserver, and Shiva the transformer or destroyer, alongside their feminine consorts Saraswati (knowledge), Lakshmi (fortune), and Parvati (power).²⁹ In lived practice, however, Brahma is rarely worshipped independently, and religious life is organized around four major denominations.

Vaishnavism is the largest denomination, centered on the worship of Vishnu as the Supreme Being, both in his transcendent form and through his earthly incarnations (avatars), who descend to restore cosmic order when dharma declines.³⁰ Of Vishnu's ten principal avatars (Dashavatara), the seventh, Rama, and the eighth, Krishna, attract the most widespread devotion, alongside Vishnu's consort Lakshmi.³¹ Vaishnava theology is predominantly dualistic or qualified non-dualistic, emphasizing loving surrender (bhakti and prapatti) through distinct lineages (sampradayas) such as Sri Vaishnavism, Vallabha's Pushtimarg, and Chaitanya Mahaprabhu's Gaudiya Vaishnavism.

Shaivism reveres Shiva as the supreme reality—simultaneously the Lord of Yoga, the ascetic dwelling on Mount Kailash, the cosmic dancer (Nataraja), and the benevolent grace that liberates souls. In temples, Shiva is most commonly worshipped in the aniconic form of the lingam, a cylindrical pillar symbolizing infinite cosmic energy, often paired with the yoni representing feminine creative power. Shaiva traditions span a wide theological spectrum, from the dualistic Shaiva Siddhanta of Tamil Nadu and the caste-rejecting Lingayat movement of Karnataka to the strictly monistic, Tantric philosophy of Kashmir Shaivism.

Shaktism focuses on the worship of Shakti or Devi, the Divine Mother viewed as the active, dynamic power that animates the universe. Shakta traditions, particularly prominent in eastern India, Assam, and Bengal, venerate the Goddess in both gentle, maternal forms such as Parvati and Lakshmi, and fierce, protective manifestations such as Durga (the slayer of the buffalo demon) and Kali (the dark goddess of time and dissolution).³² The fourth denomination, Smartism, traces its lineage to Adi Shankara and adheres to Advaita Vedanta. Smartas practice panchayatana puja, a non-sectarian domestic ritual that venerates five deities—Vishnu, Shiva, Shakti, Ganesha (the elephant-headed remover of obstacles), and Surya (the sun)—sometimes adding Skanda (Kartikeya) as a sixth, treating all of them as equal reflections of the formless Brahman.

Religious practice in Hinduism centers on cultivating a constant awareness of the divine in daily life.³³³⁴ The most ubiquitous ritual is puja, an act of ceremonial hospitality and worship performed either at a household shrine or in a temple (mandir) before a consecrated image or symbol of a deity, known as a murti.³⁵ Rather than viewing the murti as a mere physical idol, devotees understand it as a focal point in which the deity is tangibly present. Central to temple visits is darshana—the auspicious, reciprocal act of seeing the deity and being seen by the divine. During puja, worshippers or temple priests offer water, flowers, incense, fruit, and cooked food while chanting Sanskrit mantras. The ceremony typically culminates in aarti, the waving of a lit camphor or clarified butter (ghee) lamp in clockwise circles before the image, after which devotees pass their hands over the flame to receive blessings and partake of prasada, the sanctified food offering returned to the congregation.

Individual spiritual life is also structured by samskaras, a series of domestic rites of passage that sanctify key biological and social transitions from conception to death. Classical texts list up to sixteen samskaras, including namakarana (name-giving), annaprashana (an infant's first solid food), upanayana (initiation into scriptural study and the investiture of the sacred thread for certain classes), vivaha (marriage, conducted around a sacred fire), and antyesti (funeral rites).³⁶ In accordance with the belief that the physical body is a temporary vessel for the immortal atman, Hindus almost universally cremate their dead—except for young children and initiated ascetics (sannyasis), who are buried—and traditionally immerse the collected ashes in a sacred river. Across traditions, ethical practice emphasizes ahimsa (non-injury to living beings), which inspires widespread vegetarianism and the special veneration of the cow as a symbol of maternal generosity.

Communal religious life revolves around a lunisolar calendar of seasonal festivals (utsavas) and sacred pilgrimages (tirthayatra).³⁷ Major pan-Indian festivals include Diwali, the autumn festival of lights celebrating the triumph of knowledge and righteousness over darkness and the worship of Lakshmi; Holi, a spring festival marked by bonfires and the throwing of colored powders; Navratri and Vijayadashami (Dussehra), nine nights and a tenth day honoring the goddess Durga and Rama's victory over Ravana; and Maha Shivaratri, an all-night vigil dedicated to Shiva.³⁸ Pilgrimage sites, or tirthas ("fords" or crossing places), span the Indian subcontinent, encompassing the seven sacred cities (Sapta Puri), the four cardinal shrines (Char Dham), and holy rivers such as the Ganges (venerated as the goddess Ganga). The largest pilgrimage festival is the Kumbh Mela, held cyclically every three to twelve years at four river bank locations—Prayagraj, Haridwar, Nashik, and Ujjain.³⁹ The 2025 Maha Kumbh Mela at the confluence of the Ganges and Yamuna rivers in Prayagraj ran for 45 days in January and February 2025; Indian authorities reported that over 660 million pilgrims participated in the ritual bathing, making it the largest peaceful human gathering in history, though independent observers noted the difficulty of verifying exact individual counts.⁴⁰

Classical Hindu texts conceptualized social organization through the dual framework of varna (class) and ashrama (stages of life), collectively termed varnashrama dharma. The ashrama system divides an ideal human lifespan into four stages: brahmacharya (the celibate student), grihastha (the married householder supporting family and society), vanaprastha (the retired forest-dweller turning toward contemplation), and sannyasa (the wandering monastic renunciate). The varna system, first mentioned in the Purusha Sukta hymn of the Rigveda, divided society into four theoretical categories: Brahmins (priests and scholars), Kshatriyas (rulers and warriors), Vaishyas (merchants, artisans, and farmers), and Shudras (laborers and service providers).

Over the centuries, the fourfold varna model intersected with thousands of endogamous, hereditary occupational groups known as jatis (referred to as "castes" since the 16th-century Portuguese colonial encounter). Beneath the four varnas emerged communities subjected to severe social segregation and hereditary "untouchability," whose members today self-identify as Dalits. The relationship between Hindu scripture and caste hierarchy remains a subject of intense debate: while medieval legal texts such as the Manusmriti codified strict birth-based privileges and purity rules, the Upanishads, the Bhakti poet-saints, and modern reformers argued that spiritual worth depends on character and conduct rather than birth. Following independence, the 1950 Constitution of India formally abolished untouchability under Article 17, outlawed caste discrimination, and established affirmative action reservations for Scheduled Castes (Dalits) and Other Backward Classes, though social disparities and caste-based tensions persist in parts of South Asia and the diaspora.

In the 20th and 21st centuries, another major debate has centered on Hindutva ("Hindu-ness"), a political ideology articulated by Vinayak Damodar Savarkar in 1923 that defines Indian national identity primarily through Hindu cultural and civilizational heritage.⁴¹ Promoted by the Rashtriya Swayamsevak Sangh (RSS, founded in 1925), the Vishwa Hindu Parishad (VHP), and the ruling Bharatiya Janata Party (BJP), Hindutva has sought to consolidate Hindu political identity and reclaim contested historical sites.⁴² A defining milestone for the movement occurred on January 22, 2024, when Prime Minister Narendra Modi presided over the consecration (Pran Pratishtha) of the Ram Mandir in Ayodhya, Uttar Pradesh—a grand temple built on the site perceived by Hindus as the birthplace of Rama, where the 16th-century Babri Masjid stood until its demolition in 1992 and subsequent 2019 Supreme Court settlement. While supporters view Hindutva and the Ayodhya temple as a postcolonial cultural renaissance, critics, secularists, and religious freedom organizations argue that political majoritarianism departs from the pluralistic, tolerant ethos of traditional Hinduism and threatens the status of India's Muslim and Christian minorities.

Demographically, Hinduism is the most geographically concentrated of the world's major religions. According to a 2025 Pew Research Center demographic study analyzing global population changes between 2010 and 2020, the worldwide Hindu population grew by 12 percent—adding roughly 126 million people to reach nearly 1.2 billion—maintaining a stable 14.9 percent share of humanity. Approximately 99 percent of all Hindus reside in the Asia-Pacific region, and about 95 percent (roughly 1.1 billion) live in India, where they constitute 79 percent of the national population. Hindus also form a majority in Nepal (81 percent) and Mauritius (roughly 56 percent), with significant historic minorities in Bangladesh, Indonesia (particularly on the island of Bali), Sri Lanka, Pakistan, Malaysia, Fiji, Guyana, Trinidad and Tobago, and Suriname. Driven by skilled migration, the Hindu diaspora outside Asia grew rapidly during the 2010s, reaching 3.6 million in North America (including 3.0 million in the United States) and 2.2 million in Europe (including 1.1 million in the United Kingdom), alongside 1.1 million in the United Arab Emirates.