uVision or MDK

Hello
First time vising this site.
Question: what is the relation between uVision and MDK??

My situation is the following: On one side I have been told to use uVision to develop

on another side I have been told to use MDK. Which is which, are they different? is uVision an IDE built over MDK??

I see download links only for MDK. How do you get uLink if necessary?

Thanks again for any help

More questions in this forum