FIAT CURRENCY| Decentralized, government-issued currency (e.g., US Dollar, Euro)
DIGITAL CURRENCY| Decentralized, encrypted digital currency
REPRESENTATIVE MONEY| Currency that represents a claim on a commodity or asset
COMODITY-BACKED CURRENCY| Currency backed by a physical commodity
SOME EXAMPLES OF CURRENCIES INCLUDE
Euro (EUR)
Bitcoin (BTC)
US Dollar (USD)
Ethereum (ETH)
Japanese Yen (JPY)
British Pound (GBP)
Chinese Renminbi (RMB)
This is not an exhaustive list, and there are many more types of currencies and examples.