What is Ethereum Gas?

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The charge that applies to a token or coin transaction from an Ethereum platform is called Ethereum gas.

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The Ethereum blockchain requires Ethereum gas to keep itself running in the same way that a car needs gasoline to keep the lights on. All transactions on the Ethereum network cost a certain amount of gas, depending on the current demand for gas and the size and speed of the contract one is trying to execute. In this sense, running transactions over the Ethereum network is like driving a car; if you do not use enough gas, the transaction will not find its way from one party to another.

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Ethereum has it's means the fee require to complete a transaction it carryout a smart contract on the network. The gas fee is been paid with native  crypto currency of Ethereum.