I have been teaching English for over 20 years and in that time I have held various teaching titles; I had a different acronym depending on which country or school I was teaching in. Over the past 20 years, I have been an ESL, an EFL, an ESP, an ESOL and an EAL teacher. As you can see, ELT - English Language Teaching - comes with a whole host of acronyms. I will identify and describe them below.
*All terms below refer to students whose mother tongue is not English and who are learning English.