What to do if you have users who want superuser (root) access to do some of their work? Or if you just don't want to stay logged in as root?
The sudo (superuser do) tool lets you authorize others (or yourself) to perform specific commands (or groups of commands) everywhere (or on specific machines or groups of machines). I heartily recommend sudo as an invaluable tool, even if you're the only person using your Linux machine.
My sudoers file illustrates some of the capabilities of sudo, even though I'm not using much of its flexibility.