Gas, projected as a fee, is the cost needed to successfully carry out orders and smart contracts on the Ethereum platform. Quoted in units called “gwei”, its main function is to disperse the resources on the Ethereum Virtual Machine, allowing decentralized applications like smart contracts to function independently. 

To simplify further, this acts as a payment in exchange of the platform’s algorithmic energy to bring orders from one end to another. Similarly, gas is awarded to Ethereum miners who engage in verification and processing. In the event that the gas price limit declined, miners can opt out from processing the transaction.