What is the difference between ESL - EFL - ESOL?

What the difference between ESL, EFL and ESOL?
A common question is what is the difference between ESL and EFL?
ESL - English as a Second Language - it is a term used when English is taught in a country where English is not the country's first language. ESL is usually taught by teachers whose native language is English.
EFL - English as a Foreign Language - Is a term used when English is taught in a country where English is not the country's first language. EFL is usually taught by teachers whose native language is not English.