Can someone explain how "chained transactions" work? Transactions refer to UTXO - chained transactions cannot...how is this resolved? (sorry if wrong forum)

Once I started thinking how chained txs might work, I am kind of stumped. If someone can explain how it works, mighty appreciated.

submitted by /u/whyison
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source https://www.reddit.com/r/btc/comments/fgrzxb/can_someone_explain_how_chained_transactions_work/