Embedded systems play a crucial role in Industrial IoT (IIoT) by enabling real-time monitoring, control, and automation of industrial processes. These compact, dedicated systems are integrated into machines and devices to collect data, execute instructions, and ensure efficient operation. They facilitate predictive maintenance, minimize downtime, and improve overall productivity by interacting with sensors and actuators. With their ability to function under harsh industrial environments, embedded systems ensure reliability and stability in IIoT networks. Their seamless integration supports smart manufacturing and data-driven decision-making. Understanding their functionality is essential for anyone pursuing an IoT certification course.