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From the Wikipedia article
English is a West Germanic language that was first spoken in
early medieval England and is now a global lingua franca. Named
after the Angles, one of the Germanic tribes that migrated to
England, it ultimately derives its name from the Anglia (Angeln)
peninsula in the Baltic Sea. It is closely related to the Frisian
languages, but its vocabulary has been significantly influenced by
other Germanic languages, particularly Norse (a North Germanic
language), as well as by Latin and French.
English has developed over the course of more than 1,400 years. The earliest forms of English, a set of Anglo-Frisian dialects brought to Great Britain by Anglo-Saxon settlers in the 5th century, are called Old English. Middle English began in the late 11th century with the Norman conquest of England and was a period in which the language was influenced by French.
Early Modern English began in the late 15th century with the
introduction of the printing press to London, the printing of the King
James Bible and the start of the Great Vowel Shift.
Through the worldwide influence of the British Empire, modern English
spread around the world from the 17th to mid-20th centuries. Through all
types of printed and electronic media, and spurred by the emergence of
the United States as a global superpower, English has become the leading
language of international discourse and the lingua franca in many
regions and professional contexts such as science, navigation and law.
English is the third most spoken native language in the world, after Standard Chinese and Spanish. It is the most widely learned second language and is either the official language or one of the official languages in almost 60 sovereign states. There are more people who have learned it as a second language than there are native speakers. English is the most commonly spoken language in the United Kingdom, the United States, Canada, Australia, Ireland and New Zealand, and it is widely spoken in some areas of the Caribbean, Africa and South Asia. It is a co-official language of the United Nations, the European Union and many other world and regional international organisations. It is the most widely spoken Germanic language, accounting for at least 70% of speakers of this Indo-European branch. English has a vast vocabulary, though counting how many words any language has is impossible. English speakers are called "Anglophones".
Modern English grammar is the result of a gradual change from a typical Indo-European dependent marking pattern with a rich inflectional morphology and relatively free word order to a mostly analytic pattern with little inflection, a fairly fixed SVO word order and a complex syntax. Modern English relies more on auxiliary verbs and word order for the expression of complex tenses, aspect and mood, as well as passive constructions, interrogatives and some negation. Despite noticeable variation among the accents and dialects of English used in different countries and regions – in terms of phonetics and phonology, and sometimes also vocabulary, grammar and spelling – English-speakers from around the world are able to communicate with one another with relative ease.