Description: External data in the context of blockchain interoperability refers to information that originates outside the blockchain but can be utilized within it. This data can include information from various sources, such as APIs, external databases, IoT sensors, or even data from other blockchains. The ability to integrate and use this data is crucial for the functionality of decentralized applications (dApps) and smart contracts, as it allows the blockchain to interact with the real world. Interoperability becomes an essential aspect, as it facilitates communication between different systems and platforms, enabling external data to be accessible and usable within the blockchain network. This not only expands the use cases of blockchain technology but also enhances the efficiency and effectiveness of applications that rely on external information. In summary, external data is a vital component that enhances the versatility and applicability of blockchain-based solutions, allowing for a richer and more dynamic integration with the surrounding environment.