With over 90,000 unconfirmed transactions in the mempool, how does a miner select which transactions to verify? Transaction fees! The sender of a transaction has the option of adding a custom transaction fee to its transaction intended for the miner, incentivizing a miner to select the transaction and have it verified faster. Miners will select the transactions that have the highest fee attached to them to maximize profits.
What You Need to Know About the Future of Bitcoin Technology
Subhan Nadeem

Wow…interesting to see the “priority” explained.

Don Tomoff