Superuser app lets you manage the rights and access to your phone or tablet for free. You will need to have a root already installed, or an image to recover at the very least.
It is updated far more frequently than the other binary option is. The permissions on this Superuser app include the internet, NFC for tag creation and also restoring and backup for the external storage you have.
If your app has been installed with a root or even with your ROM, then nobody can bypass this and uninstall it. Your data is safe.
The Superuser app is placed using the rooting method into /system/app on your device so you would have to remount and change the whole partition if you needed to change the specifications.
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