I have seen two methods, which claim that they root an Android device, that I don't know the difference of. Method 1 is as easy as installing the SuperSU from Google Play. Method 2 is going downloading some files, going to recovery mode by pushing some complex buttons simultaneously, and much more difficult stuff. (e.g. here)
What is the difference? Does Rooting in both methods mean the same thing? If yes, why should anyone bother himself trying the second method?