PCB printed circuit board is an indispensable core component in modern electronic devices, known as the "nerve center of 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 PCB printed circuit boards make them the foundation and cornerstone of modern electronics industry.

　　The main functions of PCB printed circuit boards 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 PCB printed circuit boards 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, PCB printed circuit boards 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 PCB printed circuit boards to meet the demands of higher density, higher performance, and smaller size, driving the continuous upgrading and replacement of electronic products.

　　PCB printed circuit boards not only have a wide range of applications in consumer electronics, communication equipment, and computers, but also play an important role in industrial control, medical equipment, automotive electronics, and aerospace. Its high reliability, stability, and efficiency enable electronic devices to operate safely and efficiently, providing solid technical support and guarantee for technological innovation and social development.