structural:summarization
Hinduism (/ ˈ h ɪ n d u ˌ ɪ z əm /) is an Indian religion or dharma, a religious and universal order by which its followers abide. The word Hindu is an exonym, and while Hinduism has been called the oldest religion in the world, it has also been described as sanātana dharma (lit. ' the eternal dharma '), a modern usage, based on the belief that its origins lie beyond human history, as revealed in the Hindu texts. Another endonym for Hinduism is Vaidika dharma (lit. ' Vedic dharma ').

Hinduism entails diverse systems of thought, marked by a range of shared concepts that discuss theology, mythology, among other topics, in textual sources. Hindu texts have been classified into Śruti ("heard") and Smṛti ("remembered"). The major Hindu scriptures are the Vedas, the Upanishads, the Purānas, the Mahābhārata (incl Bhagavad Gita), the Rāmāyana, and the Āgamas. Prominent themes in Hindu beliefs include karma (action, intent and consequences) and the four Puruṣārthas, proper goals or aims of human life, namely: dharma (ethics/duties), artha (prosperity/work), kama (desires/passions) and moksha (liberation/freedom from the passions and the cycle of death and rebirth). Hindu religious practices include devotion (bhakti), worship (puja), sacrificial rites (yajña), and meditation (dhyāna) and yoga. The major Hindu denominations are Vaishnavism, Shaivism, Shaktism, and the Smarta tradition. The six Āstika schools of Hindu philosophy, which recognise the authority of the Vedas, are: Sānkhya, Yoga, Nyāya, Vaisheshika, Mimāmsā, and Vedānta.

While the traditional Itihasa-Purana and its derived Epic-Puranic chronology present Hinduism as a tradition existing for thousands of years, scholars regard Hinduism as a fusion or synthesis of Brahmanical orthopraxy with various Indian cultures, having diverse roots and no specific founder. This Hindu synthesis emerged after the Vedic period, between c. 500 –200 BCE and c. 300 CE, in the period of the second urbanisation and the early classical period of Hinduism when the epics and the first Purānas were composed. It flourished in the medieval period, with the decline of Buddhism in India. Since the 19th century, modern Hinduism, influenced by western culture, has also a great appeal to the west, most notably in the popularisation of yoga and various sects such as Transcendental Meditation and the Hare Krishna movement.

Hinduism is the world's third-largest religion, with approximately 1.20 billion followers, or around 15% of the global population, known as Hindus. It is the most widely professed faith in India, Nepal, Mauritius, and in Bali, Indonesia. Significant numbers of Hindu communities are found in other countries of South Asia, in Southeast Asia, in the Caribbean, Middle East, North America, Europe, Oceania, Africa, and other regions.