What is Gas?
Also called: gas fee, transaction fee
Gas is the fee paid for the computation and storage a transaction consumes. The price floats with network demand, so identical actions cost different amounts at different times.
In practice
Gas is a hard product constraint, not just an accounting detail. It shapes how much logic belongs onchain, and it is why Layer 2 networks and account abstraction exist. Teams targeting mainstream users increasingly sponsor gas so people never handle it directly.