In blockchain networks like Ethereum, every transaction or operation that modifies the state of the blockchain requires a fee known as gas. The gas price is the amount of cryptocurrency (measured in gwei) that a user is willing to pay for each unit of gas consumed by their transaction. This fee compensates miners for their work in processing and validating transactions. The gas limit defines the maximum amount of gas (and thus the maximum fee) a user is willing to pay for the transaction, while the actual fee paid is calculated by multiplying the gas used by the gas price set by the user.