“TEFL” is the acronym for Teaching English as a Foreign Language, or simply, English language instruction for non-native speakers. Also known as Teaching English to Speakers of Other Languages (TESOL), English Language Teaching (ELT), and teaching ESL (English as a Second Language).
In practical terms, when these terms are applied to the field of teaching English abroad, there is little or no difference between “TEFL” and “TESOL.” They are both acronyms that essentially mean the same thing: teaching the English language to non-native speakers. Likewise, in the vast majority cases, when it comes to teaching English abroad, a “TEFL certification” and a “TESOL certification” are the same and the terms are interchangeable.
On a more technical level, TESOL (Teachers of English to Speakers of Other Languages) is the term applied to the teaching of English to non-native speakers in native English speaking countries, so those who will earn degrees and work domestically in the field in the UK, Canada, Australia, Ireland, New Zealand, and South Africa and US will typically use the term “TESOL.”
ESL is English which is usually taught to students in an English speaking country. EFL is English which is taught to students in a foreign, non-English speaking country. As it is true of many European countries, where is common to learn to speak more than one foreign language. For these reasons ESL is typically the term used in the United States, an English-speaking nation, whereas EFL is more often the term of choice in countries where English is not the native language.
TEFL stands for Teaching English as a Foreign Language, and traditionally refers to teaching in non-English speaking countries. TESL stands for Teaching English as a Second Language and refers to teaching in English speaking countries, to non-native speakers living or working there.
In practice, the acronyms TEFL and TESL are often used interchangeably, and both are covered by the all-encompassing TESOL, which stands for Teaching English to Speakers of Other Languages.
以上两段文字，从不同的角度介绍了TEFL,TESOL的关系，简单总结的话，如下意思：
1，TEFL和TESOL在英语为非母语国家的英语教学中，没有什么区别，二者是相同的。所以目前国内大家能看到的TEFL证书，TESOL证书没有什么区别，主要看哪个国家认证颁发的，叫法不同。
2，我们也谈到过TESOL学历证书，这个证书是可以在英语为母语国家使用，做英语教学的，如Diploma of TESOL，Graduate Diploma of TESOL，Master in TESOL等，这个时候TEFL和TESOL是不能等同的。
3，其实很多外教来中国，他们一般认为持有的资格证书是TEFL证书，而很多外教对于国内的出现的TESOL高级，专家证书深感不惑，认为匪夷所思，因为TESOL高级，专家级别的证书在英语国家的学历框架体系中有明确的规定分别是Graduate Diploma of TESOL，Master in TESOL这样的证书课程。大家可以前往以下文章进行了解：
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TEFL/TESOL认证流程图，从了解到拿到证书的全攻略图解！
TESOL/TEFL问答合集
