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- Coins: Metal pieces issued by a government or central bank with specific denominations.
- Paper currency: Notes or bills made from paper or similar material, also issued by a government or central bank with designated values.
Electronic (digital) currency:
- Digital currency: A representation of value stored electronically, can be used for transactions but does not have physical counterparts like coins or paper bills.
- Cryptocurrency: A decentralized digital currency that typically uses cryptography for security and operates on a blockchain network.