UTXO = “Unspent Transaction Output” which is just the term for a balance of Bitcoin (denominated in units called “Satoshis” or “sats”…100,000,000 sats = 1 Bitcoin) that can spent or saved at will.
KYC = “Know Your Customer” which is a financial regulation where the identity of the customer needs to be verified before they purchase Bitcoin (or open a bank account as KYC was originally created for)
If you buy Bitcoin with no KYC that means there is no identity tied to that UTXO and it can be spent pseudonymously eg without anyone knowing the identity of the person who spent the funds.
The BTC sessions video will explain UTXO consolidation better than I can here but with the other terms defined it will make it much easier to follow.
Have a nice day! 🥩