What do these acronyms mean?
ESL, ESOL, EFL, TESL, TESOL, TEFL....
I know that they all involve learning and teaching English, but what do they really mean?
You can find them here: http://www.usingenglish.com/glossary/efl.html
There's not a huge difference. For instance, Americans tend to use ESL and British ESOL.