India, officially the Republic of India, is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world. Bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast, it shares land borders with Pakistan to the west; Bhutan, the People's Republic of China and Nepal to the northeast; and Bangladesh and Burma to the east. In the Indian Ocean, India is in the vicinity of Sri Lanka and the Maldives; in addition, India's Andaman and Nicobar Islands share a maritime border with Thailand and Indonesia.

Home to the ancient Indus Valley Civilization and a region of historic trade routes and vast empires, the Indian subcontinent was identified with its commercial and cultural wealth for much of its long history. Four of the world's major religions—Hinduism, Buddhism, Jainism and Sikhism—originated here, whereas Zoroastrianism, Christianity and Islam arrived in the 1st millennium CE and also helped shape the region's diverse culture. Gradually annexed by the British East India Company from the early 18th century and colonized by the United Kingdom from the mid-19th century, India became an independent nation in 1947 after a struggle for independence which was marked by non-violent resistance led by Mahatma Gandhi.

The Indian economy is the world's tenth largest economy by nominal GDP and fourth largest economy by purchasing power parity. Following market-based economic reforms in 1991, India has become one of the fastest growing major economies, and is considered a newly industrialized country; however, it continues to face the challenges of poverty, illiteracy, corruption and inadequate public health. A nuclear weapons state and a regional power, it has the third-largest standing army in the world and ranks tenth in military expenditure among nations.

India is a federal constitutional republic governed under a parliamentary system consisting of 28 states and 7 union territories. It is one of the 5 BRICS nations. India is a pluralistic, multilingual, and multiethnic society. It is also home to a diversity of wildlife in a variety of protected habitats.

Depending upon the historian, India's modern age begins variously in 1848, when with the appointment of Lord Dalhousie as Governor General of the Company rule in India, changes essential to a modern state, including the consolidation and demarcation of sovereignty, the surveillance of the population, and the education of citizens, were put in place, and technological changes, among them, railways, canals, and telegraph were introduced not long after being introduced in Europe; 1857, when disaffection with the Company's rule, set off by diverse resentments, which included British social reforms, harshness of land taxes, and the humiliation of landed and princely aristocracy, led to the Indian rebellion of 1857 in many parts of northern India; 1858, when after the suppression of the rebellion, the British government took over the direct administration of India, and proclaimed a unitary state, which on the one hand envisaged a limited and gradual British-style parliamentary system, but on the other hand protected India's princes and large landlords as a feudal safeguard; and 1885, when the founding of the Indian National Congress marked the beginning of a period in which public life emerged at an all-India level.

Although the rush of technology and the commercialization of agriculture in the second half of the 19th century was marked by economic setbacks—many small farmers became dependent on the whims of far away markets, there was an increase in the number of large-scale famines, and, despite the Indian taxpayers enduring the risks of infrastructure development, little industrial employment was generated for Indians,—there were also salutary effects: commercial cropping, especially in the newly canalled Punjab, increased food production for internal consumption, the railway network provided critical famine relief, reduced notably the cost of moving goods, and helped the nascent Indian owned industry. After the first world war, in which some one million Indians served, a new period began, which was marked by British reforms, but also repressive legislation, by more strident Indian calls for self-rule, and by the beginnings of a nonviolent movement of non-cooperation, of which Mohandas Karamchand Gandhi would become the leader and enduring symbol. During the 1930s, slow legislative reform was enacted by the British and the Indian National Congress won victories in the resulting elections. However, the next decade would be beset with crises, which included, the second world war, the Congress's final push of non-cooperation, and the upsurge of Muslim nationalism—all capped by the independence of India in 1947, but tempered by the bloody partition of the subcontinent into two states.

Vital to India's self-image as an independent nation was its constitution, completed in 1950, which put in place a sovereign, secular, democratic republic. In the 60 years since, India has had a mixed bag of successes and failures. On the positive side, it has remained a democracy with many civil liberties, an activist Supreme Court, and an independent press; economic liberalization in the 1990s, has created a large urban middle-class, transformed India into one of the fastest-growing economies in the world, and increased its global clout; and Indian movies, new music, and spiritual teachings, have increasingly contributed to global culture. However, on the negative side, India has been weighed down with seemingly unyielding poverty, both rural and urban; by religious and caste-related violence, by the insurgencies of Maoist inspired Naxalites, and separatists in Jammu and Kashmir; India has unresolved territorial disputes with the People's Republic of China, which escalated into the Sino-Indian War of 1962, with Pakistan which resulted in wars in 1947, 1965, 1971 and 1999, and nuclear rivalry which came to a head in 1998. India's sustained democratic freedoms, for over 60 years, are unique among the world's new nations; however, in spite of its recent economic successes, freedom from want for its disadvantaged population, remains a goal yet to be achieved.

India, the major portion of the Indian subcontinent, lies atop the Indian tectonic plate, a minor plate within the Indo-Australian Plate. India's defining geological processes commenced seventy-five million years ago when the Indian subcontinent, then part of the southern supercontinent Gondwana, began a northeastwards drift—lasting fifty million years—across the then unformed Indian Ocean. The subcontinent's subsequent collision with the Eurasian Plate and subduction under it gave rise to the Himalayas, the planet's highest mountains, which abut India in the north and the north-east. In the former seabed immediately south of the emerging Himalayas, plate movement created a vast trough which, having gradually been filled with river-borne sediment, now forms the Indo-Gangetic Plain. To the west lies the Thar Desert, which is cut off by the Aravalli Range.

The original Indian plate survives as peninsular India, the oldest and geologically most stable part of India and extends as far north as the Satpura and Vindhya ranges in central India. These parallel ranges run from the Arabian Sea coast in Gujarat in the west to the coal-rich Chota Nagpur Plateau in Jharkhand in the east. To the south the remaining peninsular landmass, the Deccan Plateau, is flanked on the west and east by the coastal ranges, Western Ghats and Eastern Ghats respectively; the plateau contains the oldest rock formations in India, some over one billion years old. Constituted in such fashion, India lies to the north of the equator between 6°44' and 35°30' north latitude and 68°7' and 97°25' east longitude.

India's coast is 7,517 kilometres (4,700 mi) long; of this distance, 5,423 kilometres (3,400 mi) belong to peninsular India and 2,094 kilometres (1,300 mi) to the Andaman, Nicobar, and Lakshadweep Islands. According to the Indian naval hydrographic charts, the mainland coast consists of the following: 43% sandy beaches, 11% rocky coast including cliffs, and 46% mudflats or marshy coast.

Major Himalayan-origin rivers that substantially flow through India include the Ganges (Ganga) and the Brahmaputra, both of which drain into the Bay of Bengal. Important tributaries of the Ganges include the Yamuna and the Kosi; the latter's extremely low gradient causes disastrous floods every year. Major peninsular rivers, whose steeper gradients prevent their waters from flooding, include the Godavari, the Mahanadi, the Kaveri, and the Krishna, which also drain into the Bay of Bengal; and the Narmada and the Tapti, which drain into the Arabian Sea. Among notable coastal features of India are the marshy Rann of Kutch in western India, and the alluvial Sundarbans delta, which India shares with Bangladesh. India has two archipelagos: the Lakshadweep, coral atolls off India's south-western coast; and the Andaman and Nicobar Islands, a volcanic chain in the Andaman Sea.

India's climate is strongly influenced by the Himalayas and the Thar Desert, both of which drive the monsoons. The Himalayas prevent cold Central Asian katabatic winds from blowing in, keeping the bulk of the Indian subcontinent warmer than most locations at similar latitudes. The Thar Desert plays a crucial role in attracting the moisture-laden southwest summer monsoon winds that, between June and October, provide the majority of India's rainfall. Four major climatic groupings predominate in India: tropical wet, tropical dry, subtropical humid, and montane.

Formative in India's 4,500 years old culture is the Vedic age in which were laid the foundation of Hindu philosophy, mythology, literary traditions, beliefs and practices, such as dhárma, kárma, yóga and mokṣa; distinctive in this culture are its diverse religions, which include Hinduism, Sikhism, Islam, Christianity and Jainism. The predominant religion, Hinduism, has been shaped by the various schools of thought including those of the Upanishads, the Yoga Sutras, the Bhakti movement, and by Buddhist philosophy.

Indian architecture represents the diversity of Indian culture. Much of it, including notable monuments such as the Taj Mahal and other examples of Mughal architecture and South Indian architecture, comprises a blend of ancient and varied local traditions from several parts of the country and abroad. Vernacular architecture also displays notable regional variation.

Indian cuisine is best known for its delicate use of herbs and spices and for its tandoori grilling techniques. The tandoor, a clay oven in use for almost 5,000 years in India, is known for its ability to grill meats to an 'uncommon succulence' and for the puffy flatbread known as the naan. The staple foods in the region are rice (especially in the south and the east), wheat (predominantly in the north) and lentils. Many spices which are consumed world wide are originally native to the Indian subcontinent. Chili pepper which was introduced by the Portuguese is widely used in Indian cuisine.

The earliest literary writings in India, composed between 1,400 BCE and 1,200 AD, were in the Sanskrit language. Prominent works of this Sanskrit literature include epics such as Mahābhārata and Ramayana, the dramas of Kalidasa such as the Abhijñānaśākuntalam (The Recognition of Śakuntalā), and poetry such as the Mahākāvya. Developed between 600 BCE and 300 AD in Southern India, the Sangam literature consisting of 2,381 poems is regarded as a predecessor of Tamil literature. From the 14th century AD to 18th century AD, India's literary traditions went through a period of drastic change because of the emergence of devotional poets such as Kabīr, Tulsīdās and Guru Nānak. This period was characterised by varied and wide spectrum of thought and expression and as a consequence, medieval Indian literary works differed significantly from classical traditions. In the 19th century, Indian writers took a new interest in social questions and psychological descriptions. During the 20th century, Indian literature was heavily influenced by the works of universally acclaimed Bengali poet and novelist Rabindranath Tagore.

Traditional Indian society is defined by relatively strict social hierarchy. The Indian caste system describes the social stratification and social restrictions in the Indian subcontinent, in which social classes are defined by thousands of endogamous hereditary groups, often termed as jātis or castes. Several influential social reform movements, such as the Brahmo Samaj, the Arya Samaj and the Ramakrishna Mission, have played a pivotal role in the emancipation of Dalits (or "untouchables") and other lower-caste communities in India. However, the majority of Dalits continue to live in segregation and are often persecuted and discriminated against.

Traditional Indian family values are highly valued, and multi-generational patriarchal joint families have been the norm in India, though nuclear families are becoming common in urban areas. An overwhelming majority of Indians, with their consent, have their marriages arranged by their parents or other family members. Marriage is thought to be for life, and the divorce rate is extremely low. Child marriage is still a common practice, more so in rural India, with more than half of women in India marrying before the legal age of 18.

Many Indian festivals are religious in origin. The best known include Diwali, Ganesh Chaturthi, Thai Pongal, Holi, Durga Puja, Eid ul-Fitr, Bakr-Id, Christmas, and Vaisakhi. India has three national holidays which are observed in all states and union territories – Republic Day, Independence Day and Gandhi Jayanti. Other sets of holidays, varying between nine and twelve, are officially observed in individual states.

Traditional Indian dress varies across the regions in its colours and styles and depends on various factors, including climate. Popular styles of dress include draped garments such as sari for women and dhoti or lungi for men; in addition, stitched clothes such as salwar kameez for women and kurta-pyjama and European-style trousers and shirts for men, are also popular. The wearing of delicate jewellery, modelled on real flowers worn in ancient India, is part of a tradition dating back some 5,000 years; gemstones are also worn in India as talismans.

Indian music covers a wide range of traditions and regional styles. Classical music largely encompasses the two genres – North Indian Hindustani, South Indian Carnatic traditions and their various offshoots in the form of regional folk music. Regionalised forms of popular music include filmi and folk music; the syncretic tradition of the bauls is a well-known form of the latter.

Indian dance too has diverse folk and classical forms. Among the well-known folk dances are the bhangra of the Punjab, the bihu of Assam, the chhau of West Bengal, Jharkhand, sambalpuri of Orissa, the ghoomar of Rajasthan and the Lavani of Maharashtra. Eight dance forms, many with narrative forms and mythological elements, have been accorded classical dance status by India's National Academy of Music, Dance, and Drama. These are: bharatanatyam of the state of Tamil Nadu, kathak of Uttar Pradesh, kathakali and mohiniyattam of Kerala, kuchipudi of Andhra Pradesh, manipuri of Manipur, odissi of Orissa and the sattriya of Assam.

Theatre in India often incorporates music, dance, and improvised or written dialogue. Often based on Hindu mythology, but also borrowing from medieval romances, and news of social and political events, Indian theatre includes the bhavai of state of Gujarat, the jatra of West Bengal, the nautanki and ramlila of North India, the tamasha of Maharashtra, the burrakatha of Andhra Pradesh, the terukkuttu of Tamil Nadu, and the yakshagana of Karnataka. The Indian film industry is the most watched film industry in the world. Established traditions exist in Assamese, Bengali, Hindi, Kannada, Malayalam, Marathi, Oriya, Tamil, and Telugu language cinemas. South India's cinema industries account for more than 75% of total film revenues.