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English evolved from the language spoken by the Germanic people of Anglo-Saxon and Jute tribes who immigrated to the British Isles from northern Europe and Scandinavia in ancient times, and spread to all parts of the world through the active exchanges of British colonists. Due to contact with many national languages in history, vocabulary has changed from unitary to pluralistic, grammar has changed from "more inflections" to "less inflections", and pronunciation has also changed regularly.

According to the number of native speakers, English is the official language of the most used countries, the most widely used second language in the world, and one of the official languages of the European Union, most international organizations and Commonwealth countries. But it has only the third mother tongue in the world, less than Chinese, Mandarin and Spanish. The leading position of Britain and America in culture, economy, military, politics and science in the last two centuries has made English an international language. Nowadays, English is used as a medium of communication in many international situations. English is also the language most closely related to computers. Most programming languages are related to English. With the use of the Internet, English is more widely used. English is one of the working languages of the United Nations.