The English language is the most commonly spoken language on Earth, either by native speakers or by people who have learned it in addition to their first language. More and more people everyday have the desire to learn English as a second language. The type of people who wish to learn it run the gamut from children in other countries who are required to learn English as part of their school curriculum, business professionals that wish to be able to communicate with their English-speaking peers, to immigrants who come to English-speaking countries such as the Unites States who need to learn the native language in order to gain employment, citizenship, and acceptance in their new home country. If you decide to become certified to teach English as a second language (TESL), you could be providing an invaluable service to thousands of people.
As an instructor of English as a second language, you have the option of going abroad and living in one of dozens of countries where there is a high demand for qualified instructors. You may also remain at home, and teach new residents of the United States how to speak, read, and write the language. Either way, you need to be certified...