English is an Indo-European, West Germanic language originating in England, and is the first language for most people in the United Kingdom, the United States, Canada, Australia, New Zealand, Ireland, and the Anglophone Caribbean. It is used extensively as a second language and as an official language throughout the world, especially in Commonwealth countries and in many international organizations.

ESL (English as a second language), ESOL (English for speakers of other languages), and EFL (English as a foreign language) all refer to the use or study of English by speakers with a different native language. The precise usage, including the different use of the terms ESL and ESOL in different countries, is described below. These terms are most commonly used in relation to teaching and learning English, but they may also be used in relation to demographic information.

ELT (English language teaching) is a widely-used teacher-centred term, as in the English language teaching divisions of large publishing houses, ELT training, etc. The abbreviations TESL (teaching English as a second language), TESOL (teaching English for speakers of other languages) and TEFL (teaching English as a foreign language) are all also used.

Other terms used in this field include EAL (English as an additional language), ESD (English as a second dialect), EIL (English as an international language), ELF (English as a lingua franca), ESP (English for special purposes, or English for specific purposes), EAP (English for academic purposes). Some terms that refer to those who are learning English are ELL (English language learner), LEP (limited English proficiency) and CLD (culturally and linguistically diverse).

London (; ) is the largest urban area and the capital of England and United Kingdom. An important settlement for two millennia, London's history goes back to its founding by the Romans. Since its settlement, London has been part of many important movements and phenomena throughout history, such as the English Renaissance, the Industrial Revolution, and the Gothic Revival. The city's core, the ancient City of London, still retains its limited medieval boundaries; but since at least the 19th century the name "London" has also referred to the whole metropolis which has developed around it.Mills, A., Dictionary of London Place Names, (2001), Oxford Today the bulk of this conurbation forms the London region of England and the Greater London administrative area, with its own elected mayor and assembly.

London is one of the world's leading business, financial, and cultural centres, and its influence in politics, education, entertainment, media, fashion and the arts all contribute to its status as a major global city.

* Inventory of World Cities, GaWC, Loughborough University Retrieved on 2007-08-16;

* Sassen, Saskia - The Global City: New York, London, Tokyo. (1991) - Princeton University Press. ISBN 0-691-07063-6. Retrieved on 2007-08-16;

* Global Cities: GaWC Inventory of World Cities 1999 Global cities#GaWC Inventory of World Cities (1999 Edition);

* Global Cities: GaWC Inventory of World Cities 2004 Global cities#GaWC Leading World Cities (2004 Edition) London boasts four World Heritage Sites: The Palace of Westminster, Westminster Abbey and St. Margaret's Church; the Tower of London; the historic settlement of Greenwich; and the Royal Botanic Gardens, Kew. The city is one of the most popular tourist destinations in the world, and its popularity has increased over the years due to economic growth.

London's diverse population draws from a wide range of peoples, cultures, and religions, and over 300 languages are spoken within the city. As of 2006, it has an official population of 7,512,400 within the boundaries of Greater London and is the most populous municipality in the European Union. As of 2001, the Greater London Urban Area has a population of 8,278,251 and the metropolitan area is estimated to have a total population of between 12 and 14 million. London will be hosting the 2012 Summer Olympics.