Prices are denoted in Gwei, (Each Gwei is equal to 0.000000001 ETH (10-9 ETH).”
Usage
Gas limit restricts the amount of data and computational effort required by miners to process a single block on the network.
Cost of each unit of gas in terms of ETH is decided by the user, who can set a high or low gas price.
Miners prioritize transactions and operations with high gas prices (and hence, higher total transaction fees) to maximize the rewards they earn on the network.