The “Teaching English as a Foreign Language” (TEFL) certificate, is the most commonly accepted certificate worldwide. This certificate allows you to teach English to non-native speakers across the globe. The main qualifications to get a TEFL is to have the ability to speak English at a native-level and then complete a course. You can complete a TEFL course either online or in a classroom. The different courses vary based on the number of hours it takes to complete.