[ Thanks to Marius Ducea for this
link. ]
“There are many situations when you will need regular users to
have more privileges than the normal user account they have. What
situations? This will depend very much on a case by case basis but
believe me there will be such cases… For example if a regular
user needs to run a program that will change some some protected
folder or file, or just a special root command (like shutdown for
example)…”