Many teaching institutions request a TESOL or other ESL teaching qualification in addition to a degree.  This is because they want to be sure that the person they hire has received professional training in the area in which s/he will be employed, namely teaching English as a Second Language. 

There are no standard requirements for TESOL. It depends on where you want to teach and at what level.  Many European countries require you to have a TESOL, TESL or TEFL certificate to teach. Other countries may simply prefer those who have certification.

http://www.how-to-teach-english-in-japan.com/tesol-certification.html

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