Satoshi, or sats for short, are a fraction of a bitcoin. Sat to a bitcoin what cents are to a dollar. It's a measurement of the same thing - bis one whole coin and are the fractions of a coin.
There are 100,000,000 satoshi (sats) in one bitcoin.
The unit was named in homage to the pseudonymous creator of Bitcoin, Satoshi Nakamoto.
And, yes, it's real money.
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