Embedded systems are crucial in the development of IoT applications because they act as the brain of connected devices. These systems control hardware functions, collect sensor data, and process information in real-time, enabling seamless communication between devices and the network. Their compact size, energy efficiency, and ability to perform dedicated tasks make them ideal for smart applications such as home automation, healthcare monitoring, and industrial control. Without embedded systems, IoT devices would lack the intelligence needed for autonomous operation. Learning how these systems work is essential for anyone pursuing an IoT certification course.