Blockchain can significantly enhance security in IoT systems by offering a decentralized and tamper-proof method for data exchange. Each transaction is recorded in a distributed ledger, making it nearly impossible to alter data without detection. This reduces the risk of cyberattacks, data breaches, and unauthorized access. Smart contracts can automate trust-based interactions between IoT devices without needing a central authority. Additionally, blockchain ensures transparency and traceability, improving the overall reliability of IoT networks. These features make it a powerful tool for safeguarding device communication. If you want to explore this intersection further, consider enrolling in an IoT certification course.