There are different types of IELTS tests you can take. IELTS can help you move around the world, get the job you've always wanted or just demonstrate that you have improved your English. The test you should choose depends on what you want to do.
Before booking your test, make sure to check which test you need with the organisations you are applying to.
Take the IELTS Academic test if you want to study at either undergraduate or postgraduate level, or if you want to work in a professional organisation in an English speaking country.
Take the IELTS General Training test to study at below degree level, work in an English speaking country or your own country and emigrate to an English speaking country.
There is a specific IELTS test for UK visas and immigration (UKVI). If you are looking to work, study or live in the UK then you may need to take this test.