Glossary
Fiat
Fiat is government-issued currency that is not backed by a physical commodity like gold, deriving its value instead from public trust and the authority of the state that issues it. National currencies such as the dollar, euro, and yen are all forms of fiat money.
The word fiat comes from Latin, meaning roughly "let it be done." A fiat currency has value because a government declares it legal tender and because people accept it in exchange for goods, services, and the settlement of debts. Unlike commodity money, it holds no intrinsic worth and is not redeemable for a fixed amount of an underlying asset. Its supply is managed by central banks and monetary authorities, which can expand or contract the amount in circulation.
The close-up: In crypto, "fiat" is shorthand for traditional national currency, as distinct from digital assets. Exchanges quote trading pairs against it, an on-ramp is where you convert fiat into crypto, and an off-ramp is the return trip. A stablecoin is often designed to track the value of a fiat currency, acting as a bridge between the two systems.
The wide shot: Fiat is the baseline that much of crypto defines itself against. Debates about inflation, monetary policy, and centralized control of money are part of why decentralized alternatives were proposed in the first place. Understanding fiat clarifies what a central bank digital currency is, how a blockchain differs from a bank ledger, and why "trustless" systems are framed as a contrast to trust-based money. This is informational only; always do your own research.