Gwei is a unit of measurement for the cryptocurrency Ethereum's native currency, Ether (ETH). It is used to represent the price of gas on the Ethereum network. Gas is a unit of measurement used to quantify the amount of computational work required to execute a specific transaction or contract on the Ethereum network. The amount of gas required for a transaction or contract execution is determined by the complexity of the operation and the amount of data being processed.
Since the cost of gas can vary depending on network demand, Gwei is used to represent the price of gas in Ether. One Gwei is equal to 0.000000001 ETH or one billionth of an ETH.