Internet of Things (IoT) refers to various devices and technologies such as various information sensors, radio frequency identification technology, global positioning system, infrared sensor, laser scanner, etc. Objects or processes collect a variety of information, light, heat, electricity, mechanics, chemistry, biology, location and other needs. Through various possible network access, the general connection between things, things, and people. Realize intelligent perception, identification and management of items and processes.   In the era of the Internet of Things, the core component of control must be controlled if it is connected to objects. This core is a printed circuit board. PCB plays a key role in IoT devices. The Internet of Things and PCB technology are developing at the same time, and the Internet of Things is leading to a paradigm change in PCB design and manufacturing. With the incredible demand for IoT devices, PCB designers need to master the complexity of Rigid, Flex, RIGID-FLEX and HDI PCBs.