Gwei is a unit of measurement used to express the cost of transactions on the Ethereum network. Specifically, it represents a fraction of the cryptocurrency Ether (ETH). One Gwei equals 0.000000001 ETH, or one billionth of an Ether.When users send transactions or execute smart contracts on Ethereum, they must pay gas fees, which are calculated in Gwei. Gas fees help compensate miners for processing transactions and maintaining the network’s security. The higher the gas price set in Gwei, the faster the transaction is likely to be processed because miners prioritize higher fees.Gwei plays a crucial role in managing congestion on the network. During times of high demand, users may need to increase their gas prices in Gwei to ensure their transactions are confirmed quickly. Overall, understanding Gwei is essential for anyone looking to interact with the Ethereum blockchain effectively. It allows users to estimate the costs associated with their activities and make informed decisions based on network conditions.