NOTE: Gwei is a small unit of the Ethereum network’s Ether (ETH) cryptocurrency. A gwei is defined as 1,000,000,000 wei, the smallest base unit of Ether. One gwei equals 0.000000001 or 10^–9 ETH. Conversely, 1 ETH represents 1 billion gwei!
Gwei is a useful denomination to calculate gas fees (paid to miners for transaction processing) in a convenient way. The higher gwei fee you choose to pay, the faster your transaction will be processed by Ethereum’s miners. You can check the latest Ethereum transaction costs at the ETH gas station.