TEFL means Teaching English as Foreign Language
TESOL means Teaching English to Speakers of Other Languages.
The terms mean the same thing and are often used interchangeably.
It doesn’t matter whether you do a TEFL course or TESOL course, but if choosing an online option, then an accredited TEFL course is important. Ensure your online TEFL certificate/TESOL certificate is awarded by an professional external accrediting TEFL body such as ACTDEC and is not just an in-house certificate. See our accreditation page for more information on why getting the right accreditation is important.