What is money??

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We collect it, worship it. But what exactly is money? How much is there and who creates it? Sounds like a dumb question but I guess I was too naive to ever ask.

Found this very informative film on the topic, not very flashy but dumbed down to a level even I could understand:

(Money as debt)
http://video.google.ca/videoplay?docid=-9050474362583451279&q=debt&total=5641&start=0&num=10&so=0&type=search&plindex=0

Curious to know what you guys think?