Apologies to the non-computer-geeks…
What?
Sudo (superuser do) is a utility for Unix- and Linux-based systems that provides an efficient way to give specific users permission to use specific system commands at the root (most powerful) level of the system.
comic by xkcd
Love it!
I fear that while means little to me currently I ahve just discovered PuTTY and have a nice VPS to play with…