What Does ESL Mean? ESL, EFL, ESOL & TEFL Explained

What does ESL mean?

ESL stands for English as a Second Language. It describes English instruction for people who use another language first. Traditionally, ESL is used when learners live where English is widely spoken; EFL is used when they study English in a non-English-speaking country. In everyday job ads, ESL is often used as an umbrella term for both.

Source: Cambridge Dictionary — ESL →

If you searched “ESL means,” you probably met a wall of initials instead of a useful explanation. Here is the practical version: ESL is the class or teaching context; TEFL and TESOL can describe the field or a teacher-training qualification; and EFL is the more precise label for most English teaching in South Korea.

Those boundaries are not policed consistently. A Korean school may advertise an “ESL teacher” role even though its students live in a country where Korean, not English, is the main community language. The label is common, and the job can be real; it is simply broader than the textbook definition.

ESL in one sentence

ESL is English taught to someone who grew up using another language.

“Second” does not have to mean literally the learner's second language. It may be their third or fourth, which is one reason some institutions prefer ESOL or “English learner.”

ESL, EFL, ESOL, TESOL and TEFL compared

The terms overlap, but they answer different questions. This table is a quick way to keep them straight.

Term	Full form	Practical meaning	Korea example
ESL	English as a Second Language	Learning English where it is used in the wider community; also a broad industry label	Often used in Korean job ads as a familiar umbrella term
EFL	English as a Foreign Language	Learning English where it is not the main community language	The precise academic description for most English classes in Korea
ESOL	English for Speakers of Other Languages	A broad term that does not assume English is literally the second language	Common in qualifications and public education terminology outside Korea
TESOL	Teaching English to Speakers of Other Languages	The profession, field of study, or a teacher-training certificate	One credential EPIK lists alongside TEFL and CELTA
TEFL	Teaching English as a Foreign Language	The field or a training certificate for teaching in non-English-speaking contexts	A common preparation route for first-time teachers applying to Korea

Term

Full form

Practical meaning

Korea example

ESL

English as a Second Language

Learning English where it is used in the wider community; also a broad industry label

Often used in Korean job ads as a familiar umbrella term

EFL

English as a Foreign Language

Learning English where it is not the main community language

The precise academic description for most English classes in Korea

ESOL

English for Speakers of Other Languages

A broad term that does not assume English is literally the second language

Common in qualifications and public education terminology outside Korea

TESOL

Teaching English to Speakers of Other Languages

The profession, field of study, or a teacher-training certificate

One credential EPIK lists alongside TEFL and CELTA

TEFL

Teaching English as a Foreign Language

The field or a training certificate for teaching in non-English-speaking contexts

A common preparation route for first-time teachers applying to Korea

Is English teaching in Korea ESL or EFL?

Academically, it is usually EFL. Students in Korea normally use Korean outside the English classroom, so English is a foreign language in the wider social environment. In hiring and recruiting, however, “ESL” is a convenient shorthand for the entire English-teaching industry.

That is why you will see both “ESL jobs in Korea” and “EFL teacher in Korea.” Do not judge a vacancy by the acronym. Check the employer, age group, schedule, contract, visa sponsorship, and whether the role is at a public school or a private academy. Our English teaching in Korea guide compares those routes.

What does an ESL teacher actually do?

The job is not simply “speaking English near students.” An English-language teacher plans lessons, models useful language, checks understanding, manages activities, gives feedback, and adjusts explanations for learners who may not share the teacher's first language.

With beginners: use clear demonstrations, short instructions, visuals, and repetition.
With intermediate learners: create structured speaking practice and correct errors without stopping every sentence.
With advanced learners: develop precision, register, argument, and subject-specific vocabulary.
In a Korean public school: plan with a Korean co-teacher and adapt to the school's curriculum and classroom roles.

A good training course should help a first-time teacher practise those decisions. If you are comparing certificates, start with our independent TEFL certificate guide for Korea. If you already know what you need, the Korvia TEFL course page covers the course options Korvia currently offers.

TEFL, TESOL and CELTA are not brands of the same product

TEFL and TESOL are broad labels, so course design and assessment vary by provider. CELTA is a specific Cambridge qualification. Cambridge says CELTA includes assessed teaching practice with groups of learners and can be taken through authorised centres. That does not make every other course unsuitable; it means you should compare the actual syllabus, assessment, tutor support, practice component, and acceptance rules rather than relying on the acronym.

For Korea, verify the requirement with the program that will review your documents. EPIK publishes its own eligibility and documentation rules, and private employers may set different preferences. A course advertised as “internationally recognised” is not enough evidence by itself.

A useful rule before you enrol

Ask the program or recruiter reviewing your application whether the exact course meets its current rules. Save the written answer, course syllabus, hour breakdown, and certificate sample. Requirements can change; marketing language is not an acceptance guarantee.

Sources and terminology notes

Cambridge Dictionary defines ESL as English as a Second Language. The British Council discusses ESOL as a wider term for English used by speakers of other languages. Cambridge's CELTA page describes CELTA as a qualification for teaching English as a foreign language and explains its teaching-practice component. For Korean public-school eligibility, use the current information on the official EPIK website.

ESL meaning: frequently asked questions

What does ESL stand for?

ESL stands for English as a Second Language. It commonly describes English classes or support for people who use another language first and are learning English. The label is widely understood, although many schools and public agencies now use terms such as English learner, EAL, ESOL, or English language teaching.

Is ESL the same as EFL?

Not exactly. ESL traditionally describes learning English where English is used in everyday society, while EFL describes learning English in a place where English is not the main community language. By that distinction, most English education in South Korea is EFL, even though Korean job ads often use ESL as a broad industry label.

Is an ESL teacher the same as a TEFL teacher?

They can describe the same person from different angles. ESL teacher describes the teaching role. TEFL means Teaching English as a Foreign Language and often describes the field or a training certificate. A teacher working in Korea may be called an ESL teacher in a job ad and hold a TEFL certificate.

What is ESOL?

ESOL means English for Speakers of Other Languages. It is a broad, inclusive term that avoids assuming whether English is a learner's second, third, or later language. Usage varies by country and institution.

Do I need an ESL degree to teach English in Korea?

A degree specifically in ESL is not the standard requirement. EPIK publishes its own eligibility rules, including degree and teacher-training requirements, while private schools set their own hiring criteria within Korean visa rules. Check the current program and visa requirements rather than relying on a job title alone.