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Crypto
UTXO
Unspent Transaction Output — the way Bitcoin and some other chains track exactly which coins are still available to spend.
UTXOs keep the blockchain simple and secure. They prevent double-spending and make privacy a bit better because it's harder to see total balances.It's like having a bunch of gift cards in your wallet — each one has a specific amount left and you spend them one at a time instead of one big balance.
Real world: When you receive Bitcoin, it shows up as separate UTXOs. When you send some, the wallet picks the right ones and gives you change as a new UTXO.
💡 You don't need to manage UTXOs yourself — good wallets do it automatically — but knowing they exist helps you understand why fees sometimes change.