New to volleyball -- What's a libero?

[Scrapper1]

Here's what it sounds like from my first class yesterday. The libero is a back-row "specialist", who can serve anytime he/she wants and who can sub in and out anytime without counting against total substitutions.

That doesn't make a lot of sense to me, but it's what it sounded like. I'm talking NCAA rules now (we use them for high school), and they don't have our rulebooks yet.