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Gwei (short for “giga-wei”) is a unit of measure for the amount of Ether (ETH) that is used to pay for the computational resources needed to execute a transaction on the Ethereum blockchain.

Users specify the amount of gas they are willing to pay for a transaction, and the gas price is typically measured in Gwei per gas unit. The gas price is set by users, and it’s a sort of “fee” they are willing to pay. Miners will typically prioritize transactions with higher gas prices, as they are more profitable to process.