EFL or ESL? TEFL or TESL?

so i want to know whats the difference between (Esl) English as a second language and (Tesl) Teaching English as a Second Language and (Efl) english as a foreign language (Tefl) teaching english as a foreign language does it really matter? i want to teach abroad so which of these should i be pursuing as a career... show more so i want to know whats the difference between (Esl) English as a second language and (Tesl) Teaching English as a Second Language and (Efl) english as a foreign language (Tefl) teaching english as a foreign language
does it really matter? i want to teach abroad so which of these should i be pursuing as a career choice to teach in a place like japan. all i have seen is Esl as classes to take i havent seen TEFL. what should i do.
Update: i get the TEFL part but in college am i suppose to get a bachelors on ESL or what ? i honestly have not seen EFL as a choice in college classes.
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