A denomination of ETH equal to 10^9 wei, commonly used to quote gas prices.
Quoting gas in gwei makes values human-readable. 1 ETH = 1e18 wei = 1e9 gwei; typical gas prices are in single to low triple-digit gwei.
If gas price is 15 gwei and a transaction uses 50,000 gas, the fee is 750,000 gwei = 0.00075 ETH (ignoring base fee burn specifics).
All terms and definitions may update as the Cryptionary improves.