Fiat money could be Dollar or Euro. It the money given out by your government.
"Fiat money (from Latin: fiat, "let it be done") is a type of money that is not backed by any commodity such as gold or silver, and typically declared by a decree from the government to be legal tender. (…)
Fiat money does not have intrinsic value and does not have use value. It has value only because the people who use it as a medium of exchange agree on its value.They trust that it will be accepted by merchants and other people."
See Wikipedia