Imagine needing tokens to pay for rides on a crowded subway system. Gas, on the Ethereum network, is kind of like that. It's a unit used to measure the computational effort needed to process transactions or run smart contracts on the Ethereum blockchain. Think of it as the "fuel" that powers the network. The more complex a transaction is, the more gas it typically uses. There are also concepts like Gas Limit (the maximum amount of gas you're willing to spend on a transaction) and Gas Price (the amount you're willing to pay per unit of gas).
