Illuminati

I'm doing a report on something, and I keep coming across the "Illuminati", but nothing the internet presents to tell me what the word means makes sense...

Can someone explain what Illuminati is/means/does?

Seriously? http://en.wikipedia.org/wiki/Illuminati

And, how exactly does one go about joining the Illuminati?

You're brought into it if your status or power appeals to their interests. One does not apply.

I see.
Reason number 27 to become President or Leader of Rebellion.

And, how exactly does one go about joining the Illuminati?

It doesn't exist..?

This is an interesting new take on it... go on?

Irregardless of whether they do or do not exist, any information about the Illuminati you may find will have been heavily influenced by Dan Brown. As a subject, it ranks second only to World Trade Centre Conspiracy Theories in terms of the bullshit you'll find.

Which subject are you writing a report for, and what are the guidelines?

EDIT: Don't tell me you're doing a book report on Angels & Demons.