Dongle to attach my 13-inch macbook pro (bought in May 2012) to a projector?

Hi!

I have an old dongle from my old macbook, and it doesn't fit. Does anyone know which dongle I should buy to fit into my 13-inch macbook pro that I bought in May 2012? I am hooking it up to a projector in the classroom.

As an aside, what is a thunderbolt for? I don't get these new ports!

Thanks in advance to anyone who can help!!!
Ricki

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