What Is a Revert-on-Failure (ROF) Mechanism in Smart Contracts?

A Revert-on-Failure (ROF) mechanism is a fundamental feature of smart contracts that ensures if any part of a transaction fails to execute its intended logic, all state changes made by that transaction are automatically undone, or 'reverted.' This ensures the contract's state remains consistent and prevents partial execution errors. It is the mechanism that enforces slippage tolerance, causing the entire transaction to fail if the executed price falls outside the set range.