Short description:
IELTS UKVI can be used for both, academic and visa purposes (Check with your specific university)
ACADEMIC IELTS can be used for academics, but not for visa purposes.
As a result, it is better to take IELTS UKVI since the beginning, otherwise, you may need to end up taking an additional IELTS just for visa purposes.
Long description:
One requirement to apply to a UK university is to obtain the required English level. Students have different options, but most of them choose to take the ACADEMIC IELTS. This IELTS can be used to comply with the University requirements but not to comply with visa requirements. This means that students will be obliged to take an additional one for visa purposes called IELTS for UKVI. What most people do not know, is that the IELTS for UKVI can also be used to comply with university requirements. Therefore, students should be encouraged to take the IELTS for UKVI in the first place, as this will save them money and time.