What are coins and dollar bills are made of?

In most large economies coins and bills are produced by the national treasury department or its equivalent. These countries also produce notes and coinage on contract for countries that don't have the industrial equipment to produce their own money.

In the United States, production of Coins and Paper Money is split between two different parts of the Treasury Department. The US Mint produces coins and the Bureau of Engraving and Printing makes bills.

It's a common misconception that Mint also makes paper money, but the two operations are completely separate.