Which gas is related to the protocol?

Excuse me, could you please elaborate on the connection between the gas and the protocol you've mentioned? Are you referring to a specific blockchain network or a decentralized application that utilizes a gas mechanism for transactions? I'm curious to understand the role this gas plays within the protocol's framework and how it contributes to the overall functioning of the system. Is it a necessary component for executing smart contracts or transactions on the network? Additionally, could you provide any examples or further details to clarify your point? Thank you for your time and assistance.