Exactly WHAT is money?

Currency has a phrase printed on it, "In God We Trust".  Because God help us if we stop trusting that money will get us what we want in a transaction.  Barter sucks.  And we're not on any kind of Gold Standard.  In other words, ONLY faith, trust and confidence that our electronic digits in a bank account can allow us to buy what we want keeps it going.  NOTHING backs up our US Dollar other than that intangible, ephemeral concept.    http://www.theonion.com/articles/us-economy-grinds-to-halt-as-nation-realizes-money,2912/