It's really not that simple. But it's fair to say that while a masters can often be a very straightforward training to get you ready for a particular job, you r

It's really not that simple. But it's fair to say that while a masters can often be a very straightforward training to get you ready for a particular job, you really shouldn't go into a PhD program without a good idea of a) why and b) where you are aiming for afterward. For STEM I would usually add c) someone else is paying for it