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 of other languages. 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), and ELL (English language learner). A somewhat similar term, LEP (limited English proficiency), is also used in this field.

Terminology and types

The many acronyms used in the field of English teaching and learning may be confusing. English is a language with great reach and influence; it is taught all over the world under many different circumstances. In English-speaking countries, English language teaching has essentially evolved in two broad directions: instruction for people who intend to stay in the country and those who don't. These divisions have grown firmer as the instructors of these two "industries" have used different terminology, followed distinct training qualifications, formed separate professional associations, and so on. Crucially, these two arms have very different funding structures, public in the former and private in the latter, and to some extent this influences the way schools are established and classes are held. Matters are further complicated by the fact that the United States and the United Kingdom, both major engines of the language, describe these categories in different terms: as many eloquent users of the language have observed, "England and America are two countries divided by a common language." (Attributed to Winston Churchill, George Bernard Shaw, and Oscar Wilde.) The following technical definitions may therefore have their currency contested.

English outside English-speaking countries

EFL indicates the use of English in a non-English-speaking region. Study can occur either in the student's home country, as part of the normal school curriculum or otherwise, or, for the more privileged minority, in an anglophone country which they visit as a sort of educational tourist, particularly immediately before or after graduating from university. TEFL is the teaching of English as a foreign language; note that this sort of instruction can take place in any country, English-speaking or not. Typically, EFL is learned either to pass exams as a necessary part of one's education, or for career progression while working for an organisation or business with an international focus. EFL may be part of the state school curriculum in countries where English has no special status (what Braj Kachru calls the "expanding circle countries"); it may also be supplemented by lessons paid for privately. Teachers of EFL generally assume that students are literate in their mother tongue.

English within English-speaking countries

The other broad grouping is the use of English within the Anglosphere. In what theorist Braj Kachru calls "the inner circle", i.e. countries such as the United Kingdom and the United States, this use of English is generally by refugees, immigrants and their children. It also includes the use of English in "outer circle" countries, often former British colonies, where English is an official language even if it is not spoken as a mother tongue by the majority of the population.

In the US, Canada and Australia, this use of English is called ESL (English as a second language). This term has been criticised on the grounds that many learners already speak more than one language. A counter-argument says that the word "a" in the phrase "a second language" means there is no presumption that English is the second acquired language. TESL is the teaching of English as a second language.

In the UK, Ireland and New Zealand, the term ESL has been replaced by ESOL (English for speakers of other languages). In these countries TESOL (teaching English to speakers of other languages) is normally used to refer to teaching English only to this group. In the UK, the term EAL (English as an additional language), rather than ESOL, is usually used when talking about primary and secondary schools. In the United States, the term English language learner (ELL) is used by governments and school systems. It differs from the other terms above because it refers to learners rather than the language.

Typically, this sort of English (called ESL in the United States, Canada, and Australia, ESOL in the United Kingdom, Ireland and New Zealand) is learned to function in the new host country, e.g. within the school system (if a child), to find and hold down a job (if an adult), to perform the necessities of daily life. The teaching of it does not presuppose literacy in the mother tongue. It is usually paid for by the host government to help newcomers settle into their adopted country, sometimes as part of an explicit citizenship program. It is technically possible for ESL to be taught not in the host country, but in, for example, a refugee camp, as part of a pre-departure program sponsored by the government soon to receive new potential citizens. In practice, however, this is extremely rare.

Particularly in Canada and Australia, the term ESD (English as a second dialect) is used alongside ESL, usually in reference to programs for Canadian First Nations people or indigenous Australians, respectively. It refers to the use of standard English, which may need to be explicitly taught, by speakers of a creole or non-standard variety. It is often grouped with ESL as ESL/ESD.

Umbrella terms

All these ways of teaching English can be bundled together into an umbrella term. Unfortunately, all the English teachers in the world cannot agree on just one. The term TESOL (teaching English to speakers of other languages) is used in American English to include both TEFL and TESL. British English uses ELT (English language teaching), because TESOL has a different, more specific meaning; see above.

Which variety to teach

It is worth noting that ESL and EFL programs also differ in the variety of English which is taught; "English" is a term that can refer to various dialects, including British English, American English, and others. Obviously, those studying English in order to fit into their new country will learn the variety spoken there. However, for those who do not intend to change countries, the question arises of which sort of English to learn. If they are going abroad for a short time to study English, they need to choose which country. For those staying at home, the choice may be made for them in that private language schools or the state school system may only offer one model. Students studying EFL in Hong Kong, for example, are more likely to learn British English, whereas students in the Philippines are more likely to learn American English.

For this reason, many teachers now emphasize teaching English as an international language (EIL), also known as English as a ­lingua franca (ELF). Linguists are charting the development of international English, a term with contradictory and confusing meanings, one of which refers to a decontextualised variant of the language, independent of the culture and associated references of any particular country, useful when, for example, a Saudi does business with someone from China or Albania.