A Satoshi is the smallest fraction of a Bitcoin that can currently be sent: 0.00000001 BTC. In the future, however, the protocol may be updated to allow further subdivisions, should they be needed.
Further examples of units
- 1 BTC = 10,000,000 Satoshis
- 1 BTC = 1,000 mBTC (millibitcoin)
- 1 mBTC = 10,000 Satoshis
- 1 μBTC (microbitcoin) = 10 Satoshis
