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India (ⁱ/ˈɪndiə/), officially the Republic of India (Bhārat Gaṇarājya), 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 south-west, and the Bay of Bengal on the south-east, it shares land borders with Pakistan to the west; China, Nepal, and Bhutan to the north-east; and Burma and Bangladesh 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.

Hinduism is the predominant religion of the Indian subcontinent, and one of its indigenous religions. Hinduism includes Shaivism, Vaishnavism and Śrauta among numerous other traditions. It also includes historical groups, for example the Kapalikas. Among other practices and philosophies, Hinduism includes a wide spectrum of laws and prescriptions of "daily morality" based on the notion of karma, dharma, and societal norms. Hinduism is a conglomeration of distinct intellectual or philosophical points of view, rather than a rigid common set of beliefs.

Hinduism is formed of diverse traditions and has no single founder. Among its direct roots is the historical Vedic religion of Iron Age India and, as such, Hinduism is often called the "oldest living religion" or the "oldest living major religion" in the world.

One orthodox classification of Hindu texts is to divide into Śruti ("revealed") and Smriti ("remembered") texts. These texts discuss theology, philosophy, mythology, rituals and temple building among other topics. Major scriptures include the Vedas, Upanishads, Purāṇas, Mahābhārata, Rāmāyaṇa, Bhagavad Gītā and Āgamas.

Pūjā or alternative transliteration Pooja, (Devanagari: पूजा) (Sanskrit: reverence, honour, adoration, or worship) is a religious ritual performed by Hindus as an offering to various deities, distinguished persons, or special guests. It is done on a variety of occasions and settings, from daily puja done in the home, to temple ceremonies and large festivals, or to begin a new venture. Puja is modeled on the idea of giving a gift or offering to a deity or important person and receiving their blessing (Ashirvad). The two main areas where puja is performed is in the home and at public temples. There are many variations in scale, offering, and ceremony. Puja is also performed on special occasions such as Durga Puja and Lakshmi Puja. The puja ritual is performed by Hindus worldwide. Various poojas are performed at various times of the day and on various occasions.

A facial expression is one or more motions or positions of the muscles in the skin. These movements convey the emotional state of the individual to observers. Facial expressions are a form of nonverbal communication. They are a primary means of conveying social information among humans, but also occur in most other mammals and some other animal species.

Humans can adopt a facial expression to read as a voluntary action. However, because expressions are closely tied to emotion, they are more often involuntary. It can be nearly impossible to avoid expressions for certain emotions, even when it would be strongly desirable to do so;^{[citation needed]} a person who is trying to avoid insulting an individual he or she finds highly unattractive might nevertheless show a brief expression of disgust before being able to reassume a neutral expression.^{[citation needed]} Microexpressions are one example of this phenomenon. The close link between emotion and expression can also work in the other direction; it has been observed that voluntarily assuming an expression can actually cause the associated emotion (Schnall & Laird, 2003; Soussignan, 2002 as cited in Papa & Bonanno, 2008).

Some expressions can be accurately interpreted even between members of different species- anger and extreme contentment being the primary examples. Others, however, are difficult to interpret even in familiar individuals. For instance, disgust and fear can be tough to tell apart.^{[citation needed]}

The demographics of India are inclusive of the second most populous country in the world, with over 1.21 billion people (2011 census), more than a sixth of the world's population. Already containing 17.5% of the world's population, India is projected to be the world's most populous country by 2025, surpassing China, its population reaching 1.6 billion by 2050. Its population growth rate is 1.41%, ranking 102nd in the world in 2010.

India has more than 50% of its population below the age of 25 and more than 65% hovers below the age of 35. It is expected that, in 2020, the average age of an Indian will be 29 years, compared to 37 for China and 48 for Japan; and, by 2030, India's dependency ratio should be just over 0.4.

India has more than two thousand^{[citation needed]} ethnic groups, and every major religion is represented, as are four major families of languages (Indo-European, Dravidian, Austro-Asiatic and Tibeto-Burman languages) as well as two language isolates (the Nihali language spoken in parts of Maharashtra and the Burushaski language spoken in parts of Jammu and Kashmir).

Religion is a collection of cultural systems, belief systems, and worldviews that establishes symbols that relate humanity to spirituality and, sometimes, to moral values. Many religions have narratives, symbols, traditions and sacred histories that are intended to give meaning to life or to explain the origin of life or the universe. They tend to derive morality, ethics, religious laws or a preferred lifestyle from their ideas about the cosmos and human nature.

The word religion is sometimes used interchangeably with faith or belief system, but religion differs from private belief in that it has a public aspect^{[citation needed]}. Some religions have organized behaviors, clergy, a definition of what constitutes adherence or membership, congregations of laity, regular meetings or services for the purposes of veneration of a deity or for prayer, holy places (either natural or architectural), and/or scriptures. The practice of a religion may also include sermons, commemoration of the activities of a god or gods, sacrifices, festivals, feasts, trance, initiations, funerary services, matrimonial services, meditation, music, art, dance, public service, or other aspects of human culture. However, there are examples of religions for which some or many of these aspects of structure, belief, or practices are absent.

Old age consists of ages nearing or surpassing the average life span of human beings, and thus the end of the human life cycle. Euphemisms and terms for old people include seniors (American usage), senior citizens (British and American usage) and the elderly.

Old people have limited regenerative abilities and are more prone to disease, syndromes, and sickness than younger adults. For the biology of ageing, see senescence. The medical study of the aging process is gerontology, and the study of diseases that afflict the elderly is geriatrics.

Humans (known taxonomically as Homo sapiens, Latin for "wise man" or "knowing man") are the only living species in the Homo genus. Anatomically modern humans originated in Africa about 200,000 years ago, reaching full behavioral modernity around 50,000 years ago.

Humans have a highly developed brain and are capable of abstract reasoning, language, introspection, and problem solving. This mental capability, combined with an erect body carriage that frees the hands for manipulating objects, has allowed humans to make far greater use of tools than any other living species on Earth. Other higher-level thought processes of humans, such as self-awareness, rationality, and sapience, are considered to be defining features of what constitutes a "person".^{[citation needed]}

Humans are uniquely adept at utilizing systems of communication for self-expression, the exchange of ideas, and organization. Humans create complex social structures composed of many cooperating and competing groups, from families and kinship networks, to nations. Social interactions between humans have established an extremely wide variety of values, social norms, and rituals, which together form the basis of human society. With individuals widespread in every continent except Antarctica, humans are a cosmopolitan species. As of November 2011^[update], the human population was estimated by the United Nations Population Division to be about 7 billion, and by the United States Census Bureau to be about 6.97 billion.