Online TESOL Certification,Teach English Abroad - Are you interested in working as an English language teacher around the world? UNI-Prep's online TESOL & TEFL Certificate program qualifies an individual to work as an English and ESL/EFL teacher internationally. The program is completely online and is 120-hours in length. Since the course is online, it allows you the option to study from anywhere in the world as long as you have a computer with an internet connection