The smallest denomination of Bitcoin, named after its pseudonymous creator(s), Satoshi Nakamoto. One sat represents 1/100,000,000 (one hundred-millionth) of a bitcoin or 0.00000001 BTC.
Bitcoin's divisibility down to one hundred-millionth of a bitcoin makes it suitable for micropayments, and denominating amounts in sats keeps these small transactions easy to express, which is especially useful when sending or receiving via the Lightning Network.
