When you make a transaction on networks like Ethereum, you pay "gas" – this is the fee that compensates for the computational power needed to process and verify your operation by miners.
Gas price: Measured in Gwei (a small fraction of ETH).
Gas limit: The maximum amount of gas you are willing to pay for the transaction.
Volatility: The gas price can vary greatly depending on network congestion. Understanding the concept of gas will help you better manage your transactions and avoid overpaying.