Noobii and BitTorrent?

I am currently downloading using BitTorrent. This is an great program.
Can someone explain how this works. I understand the downloading and
uploading idea but how does it work?
I am not a computer science major so I don't understand how this works
under the hood. I would like a general idea how these computers connect
and find each other to make the up loading?
Thanks
Mike the noobii!

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