

A TEFL or TESOL certificate is the practical minimum for most teaching jobs abroad. But two certificates with the same name can be treated very differently by employers and by immigration authorities.
Some visa processes look at your certificate directly. China's Z-visa, for instance, asks for an accredited TEFL/TESOL certificate of 120 or more hours (or two years of documented experience). Brazilian language schools typically expect a TEFL certificate plus a degree. In Cambodia, a TEFL certificate is often the practical minimum even where a degree is not required.
Requirements differ widely. Cambodia is one of the few Asian markets where many language centres do not require a university degree. China and Brazil do. Costa Rica does not legally require one, but non-North-American applicants are often expected to hold one.
Browse the courses on World Teachers Academy to compare certification options, and use the country guides to check what your destination expects.