IELTS, or the International English Language Testing System, is a well-known test that shows how well you can use English. If you want to move to another country, study there, or work in a place where English is the main language, you might need to take the IELTS test.
There are two main versions of the IELTS:
To move to a new country, many immigration offices ask for certain IELTS scores. This shows you can speak English well, so you can fit in, work, and study easily in your new home.