Securing connected devices has become a central concern as deployments scale from pilot projects to critical infrastructure. IoT Security is no longer a niche technical topic but a foundational requirement shaping how systems are designed, deployed and operated across industries. The expansion of connected endpoints—often distributed, resource-constrained and remotely managed—has widened the potential attack surface in ways that traditional IT security models were not built to handle. For organizations building or operating connected systems, the challenge is not only to mitigate known risks but to anticipate how evolving threats interact with heterogeneous devices, networks and cloud platforms. Understanding IoT Security requires looking beyond individual components to the full lifecycle of connected systems, from hardware design to data processing and long-term maintenance. Key Takeaways - IoT Security addresses risks across the entire lifecycle of connected devices, from manufacturing to decommissioning. - The distributed nature of IoT systems expands the attack surface, requiring layered and architecture-level protections. - Secure-by-design principles are increasingly replacing reactive security approaches in modern deployments. - Standards, identity management and encryption are core building blocks of resilient IoT environments. - Balancing security with cost, power consumption and scalability remains a key engineering challenge. What is IoT Security? IoT Security refers to the set of technologies, processes and design principles used to protect connected devices, networks and data in Internet of Things environments from unauthorized access, manipulation or disruption. It encompasses hardware, software and network-level protections applied throughout the lifecycle of IoT systems. Within the broader IoT ecosystem, security acts as an enabling layer that ensures trust between devices, platforms and users. Without adequate safeguards, connected systems become vulnerable to attacks that can compromise data integrity, disrupt operations or create physical safety risks—particularly in industrial, healthcare or infrastructure applications. Unlike traditional IT environments, IoT deployments often involve constrained devices,