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What is a “fiat” currency? Are there other types of currency?
A "fiat" currency is non-convertible paper currency that a government establishes as legal tender. Most countries today are using fiat currencies. The rest have currencies pegged (or convertible to) US Dollars (which is a fiat currency). In the past, money was usually based on precious metals such as gold or silver. Until the end of the gold standard, you could theoretically go the the US Treasury with a US Note or Federal Reserve Note and convert the note into a fixed quantity of gold or silver (depending on the note). The US had a bi-metallic currency policy for political reasons, which means that money was backed by both gold and silver.