English as a second language (ESL), bilingual teaching, and teaching English as a second language (TESOL), is the practice of teaching students who do not speak English as their native language. Students at school in the United States without a strong background in English are at a great disadvantage and face unique problems. ESL/Bilingual/TESOL instructors are there to ensure that these students are getting a quality education. Further, teachers who are certified in ESL and TESOL are qualified to teach overseas in many countries. If you enjoy traveling, this is an excellent degree to obtain. Individuals in this field earn around $45,000 a year.