Bitcoin, Confidential Transactions, Bulletproofs, Privacy, Fungibility.
I can send money to it. My operation will create a UTXO, which only you can spend. Let’s assume you got 1BTC from me and you want to buy Alpaca socks for 0.1BTC. In this case you would create a transaction with an input of 1BTC, with a payment output of 0.1BTC and a change output that goes back to