English is a West Germanic language originating in England, and the first language for most people in Australia, Canada, the Commonwealth Caribbean, Ireland, New Zealand, the United Kingdom and the United States of America (also commonly known as the Anglosphere). It is used extensively as a second language and as an official language throughout the world, especially in Commonwealth countries and in many international organisations.

Modern English is sometimes described as the global lingua franca.^[1][2] English is a dominant international language in communications, science, business, aviation, entertainment, radio and diplomacy.^[3] The influence of the British Empire is the primary reason for the initial spread of the language far beyond the British Isles.^[4] Since World War II, the growing economic and cultural influence of the United States has significantly accelerated the adoption of English.^[2]

A working knowledge of English is required in certain fields, professions, and occupations. As a result, over a billion people speak English at least at a basic level (see English language learning and teaching). English is one of six official languages of the United Nations.

Source: wikipedia. 

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