Gas

Gas is a unit that measures the computational power needed for some blockchains to complete a transaction. Ethereum, which coined the term, calls it “the fuel that allows [the network] to operate”.

While gas is a simple concept, the term is sometimes used in ways that can be confusing for beginners:

The concept of “gas" used strictly to mean the computational power needed to complete a transaction is specific to Ethereum and Ethereum-compatible blockchains like Polygon, Avalanche, and Fantom.