BitcoinBeginner
Change output
A Bitcoin transaction output that returns unused input value to the sender.
PLAIN-ENGLISH DEFINITION
In more detail
Bitcoin inputs are spent completely, even when the payment is smaller than their total value. Your wallet normally creates a change output for the remainder after the payment and fee. Without an output assigning that remainder, it becomes transaction fee instead; change isn't an extra charge.
IN THE WILD
How you might use it
You spend a 0.01 BTC UTXO to send 0.003 BTC. A change output returns the remainder after the transaction fee.
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