A Boolean expression is a logical statement that can only be true or false. It typically uses operators like AND, OR, and NOT to combine different conditions. In programming and computer science, these expressions help control the flow of decisions based on specific criteria.In cryptocurrency, Boolean expressions play a vital role in smart contracts and decentralized applications. For instance, a smart contract might execute a transaction only if certain criteria are satisfied, like whether the sender has enough funds and the recipient is valid.Boolean expressions enable developers to structure these conditions efficiently. By using logical operations, they can create complex rules that define how various components interact. This aids in automating processes and ensuring that conditions are met before certain actions are taken.Overall, Boolean expressions provide a foundational method for implementing logic and decision-making in code, enhancing the reliability and security of applications in this space.