4 socket core board and green sticker, also known as compact printed circuit boards (PCBs), are where the central processing unit (CPU) of an electronic system is located. These are widely utilised in embedded systems or Internet of Things (IoT) devices when a compact and efficient design is required. The core board houses the main components of the system, including the CPU, memory, and input/output interfaces, as well as any crucial power management circuitry. 4 socket core board and green sticker are designed to be assembled with additional components, such as communication or sensor modules, to create a complete electronic device.