"Mempool" is short for Memory Pool. Think of it as a global "waiting room" or a "digital foyer" where your transaction sits after it is sent, but before it is confirmed by a miner.

How it Works: The Departure Lounge

Submission: When you send Bitcoin, your wallet broadcasts the transaction to the network.
The Pool: Every "Node" (the computers running the Bitcoin software) has its own Mempool. They collect these pending transactions and hold them in their memory.
The Selection: Miners look into the Mempool and pick which transactions they want to include in the next block.

The "Bidding" System

The Mempool isn't a "First In, First Out" queue like a grocery store line. It’s more like a priority auction:

The Incentive: Space in a Bitcoin block is limited (roughly 1MB to 4MB).
The Fee: To get to the front of the line, you attach a transaction fee.
The Choice: Miners naturally want to make the most money, so they "cherry-pick" the transactions with the highest fees first.

Why it Matters

Congestion: When the network is busy, the Mempool fills up. If you paid a low fee, your transaction might sit in the "waiting room" for hours or even days.
Transaction Finality: A transaction is only "final" once it leaves the Mempool and is carved into a block on the blockchain.

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https://www.dbm.academy/faq for more blockchain vocabulary.

Check out the FREE DBM Academy Course | An Introduction to your Blockchain Journey - https://www.dbm.academy/blog/93993-free-course-an-introduction-to-your-blockchain-journey

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