Printed Circuit Board (PCB) is the heart and nerve center of modern electronic products. It achieves electrical connection and signal transmission between electronic components by printing conductive circuits on insulating substrates. The widespread application and importance of printed circuit boards (PCBs) make them the foundation and core of modern electronics industry.

　　The main functions of a printed circuit board (PCB) include electrical connections, signal transmission, and component support. By installing various electronic components such as resistors, capacitors, transistors, and integrated circuits on circuit boards, electronic products can achieve complex functions and efficient operation. The manufacturing process of printed circuit boards (PCBs) is very complex, including multiple steps such as circuit design, substrate selection, copper foil etching, drilling, and surface treatment. Each step requires strict quality control and precise process technology.

　　With the continuous development of electronic technology, printed circuit boards (PCBs) are also constantly innovating and advancing. The emergence of emerging technologies such as high-density interconnect (HDI), flexible circuit board (FPC), and three-dimensional circuit board (3D PCB) has enabled printed circuit boards (PCBs) to meet the demands of higher density, higher performance, and smaller size, driving the continuous upgrading and replacement of electronic products.