I don't know whether my Android tablet is rooted or not,but I always update it. I came across this app Superuser,and downloaded it,but I really don't know its actual functions in an unrooted or rooted Android tablet.
I have wikipediad it,I cant really fathom anything said,In a tech newbie talk what is its functions?

Think of Superuser as the controller of which apps have access to the core functions of your phone. It is only useful if you have root. You can check if you have root by installing root checker from the play store.

Lord_Reed: Think of Superuser as the controller of which apps have access to the core functions of your phone. It is only useful if you have root. You can check if you have root by installing root checker from the play store.

I downloaded root checker app,it confirmed that my device has root access.Hence what are the needs of superuser and DriodVPN apps to my device?.

indigene:
I downloaded root checker app,it confirmed that my device has root access.Hence what are the needs of superuser and DriodVPN apps to my device?.

Without Superuser you won't be able to control access to your rooted phone. Everything including viruses will be able to modify your phone, you certainly don't want that. As for DroidVPN I don't have much experience with it so I don't know it's functions yet.