Monads. How do they work?

I'm reading "Learn you a haskell for great good." I've gotten through most of it but I want to learn about Monads.

What the fuck are they?
What is their purpose?
How do they work?

>>21
That's not true and I am able to prove it, but I don't give enough of a fuck.
>>22
Have you seen the rest of the Internet? I recommend a look at GameFAQs. Nobody cares about forcing obsolete rules anymore.