Language is a mean of communication

Human language is unique because it has the properties of productivity, recursivity, and displacement, and because it relies entirely on social convention and learning. Its complex structure therefore affords a much wider range of possible expressions and uses than any known system of animal communication. Language is thought to have originated when early hominins started gradually changing their primate communication systems, acquiring the ability to form a theory of other minds and a shared intentionality.

This development is sometimes thought to have coincided with an increase in brain volume, and many linguists see the structures of language as having evolved to serve specific communicative and social functions. Language is processed in many different locations in the human brain, but especially in Broca's and Wernicke's areas. Humans acquire language through social interaction in early childhood, and children generally speak fluently when they are approximately three years old. The use of language is deeply entrenched in human culture. Therefore, in addition to its strictly communicative uses, language also has many social and cultural uses, such as signifying group identity, social stratification,

Languages evolve and diversify over time, and the history of their evolution can be reconstructed by comparing modern languages to determine which traits their ancestral languages must have had in order for the later stages to have occurred. A group of languages that descend from a common ancestor is known as a language family. The languages that are most spoken in the world today belong to the Indo-European family, which includes languages such as English, Spanish, Portuguese, Russian, and Hindi; the Sino-Tibetan languages, which include Mandarin Chinese, Cantonese, and many others; Semitic languages, which include Arabic, Amharic, and Hebrew; and the Bantu languages, which include Swahili, Zulu, Shona, and hundreds of other languages spoken throughout Africa. The consensus is that between 50 and 90% of languages spoken today will probably have become extinct by the year 2100.