Teaching English as a second language (TESL) refers to teaching English to students whose first language is not English, usually offered in a region where English is the dominant language and natural English language immersion situations are apt to be plentiful.In contrast, teaching English as a foreign language (TEFL) refers to teaching English to students whose first language is not English, usually in a region where English is not the dominant language and natural English language immersion situations are apt to be few.