Bureau Of Engraving

the currency (Federal Reserve Notes ) is a product of the Fed, although the Bureau of Engraving and Printing creates what isn't introduced into the system digitally. The Treasury trades bills, notes and bonds for the currency, and the Fed auctions those off. The FRN's are secured by the Treasuries.

The Treasury issued United States Notes for many years ( simultaneous with the Federal Reserve notes, but in much smaller quantities ), but they no longer do.

Federal Reserve Notes do not fit the true definition of money, by the way- they are bills of credit. They each represent a portion of a loan, because all Federal Reserve notes enter the system as new debt.

I wish I could explain why the Fed is necessary, but I can't. The founding fathers certainly never thought that any private banks should come between the people and their money supply