It refers to the amount of price that the user is willing to pay for every unit of gas used to execute a transaction. Gas price is measured in subunits; the smallest unit is “Wei”. “Gwei” unit is frequently used which consists of billions of “Wei”. The analogy for the gas price is that it is the related cost of car fuel that you’re paying for filling up the car.
Setting up high gas price mobilize the miners to validate and prioritize specific transaction onward of those set at a lower gas price. Before entering the trade, it is good to look at the gas price. You can check the current gas price from ETH Gas Station.