Definition
Fiat currency is money issued within a governmental monetary system rather than backed by a fixed commodity-conversion promise. Examples include the US dollar and the Japanese yen. Its acceptance reflects monetary institutions, economic activity, confidence and the rules of the relevant jurisdiction. Fiat money can exist as notes, coins or balances; it is not limited to physical cash.
Role in Crypto Markets
Fiat currencies provide a reference unit for prices and are used when entering or leaving crypto markets through payment providers and exchanges. In a BTC/USD quote, USD expresses the price of one BTC. A token designed to track USD is a separate asset, not automatically the same as a dollar balance with a bank.
Key Considerations
Inflation can change purchasing power, and exchange rates change the value of one currency relative to another. Deposits, cash and tokenized claims may have different providers, access conditions and legal protections. When moving between fiat and crypto, conversion rates, payment fees and settlement times should be distinguished from blockchain transaction fees.