The concept of gas was introduced to maintain a distinct value layer that solely indicates the consumption toward computational expenses on the Ethereum network. Having a separate unit for this purpose allows for a practical distinction between the actual valuation of the cryptocurrency (ETH), and the computational cost of using Ethereum’s virtual machine (EVM). Here, gas refers to Ethereum network transaction fees, not the gasoline for your car.
Gas fees are payments made by users to compensate for the computing energy required to process and validate transactions on the Ethereum blockchain. “Gas limit” refers to the maximum amount of gas (or energy) that you’re willing to spend on a particular transaction. A higher gas limit means that you must do more work to execute a transaction using ETH or a smart contract.