[ID:0558] With well over a billion people learning English worldwide, it’s safe to say that the TEFL (Teaching English as a Foreign Language) market is booming. It is relatively easy to get a job teaching in any country where English is not the first language. The field is wide open, both for experienced teachers and for world travelers looking to finance a sojourn abroad. In many countries, English is taught from elementary school right up to university level, as well as in large companies, private language schools and one-on-one tutoring sessions.

English is the international language of business, science and air traffic control; and over the past few decades, it has become the world’s dominant...