Gas price is a fee paid to validators for verifying transactions on blockchain networks like Ethereum. The term “Gas” is a measure of the computational work needed to process transactions and smart contracts on the network. Complex smart contracts need more gas to execute. Ethereum and Polygon use the term "gas fees," while the Bitcoin blockchain use "transaction fees" or “miner fees”. On Ethereum, gas fees are in Gwei, a unit of its cryptocurrency Ether.