There are many types of circuit boards with different names, which can be named based on materials, layers, inherent characteristics, and other aspects. For example, there are: single panel, double-sided board, multi-layer board, HDI, fast board, FR4 circuit board, ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high-frequency board, thick copper board, impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board, Printing (copper etching technology) circuit boards, etc. Circuit boards are miniaturized and intuitive, playing an important role in the mass production of fixed circuits and optimizing the layout of electrical appliances

　　Printed circuit boards (PCBs) are essential accessories in modern electronic equipment. All electronic devices, whether they are large machinery, personal computers, communication base stations, mobile phones, household appliances, or electronic toys, use printed circuit boards.

　　The composition of printed circuit boards mainly consists of two types of materials: insulation substrate and conductor, which play a role in supporting, interconnecting, and some circuit components in electronic equipment. Integrated circuits, resistors, capacitors, and other electronic components cannot function as individual units. Only by having a foothold on the printed circuit board and connecting it with conductive junctions can they function as a whole. A printed circuit board is the skeleton that supports components and serves as a conduit for connecting electrical signals. In addition, some printed circuit boards are equipped with components such as resistors, capacitors, and inductors, which become functional circuits and serve as air ducts.

　　The role of printed circuit boards in electronic equipment includes providing mechanical support for fixing and assembling components such as transistors, integrated circuits, resistors, capacitors, inductors, etc; Implement wiring, electrical connections, and insulation between components such as transistors, integrated circuits, resistors, capacitors, and inductors to meet their electrical characteristics; Provided recognition characters and graphics for the inspection and maintenance of components in electronic assembly processes, and provided solder mask graphics for wave soldering.

　　Due to the use of printed circuit boards in electronic equipment, manual wiring errors are avoided and automatic insertion, welding, and testing are achieved. This ensures the quality and reliability of electronic complete machine products, improves labor productivity, reduces production costs, and facilitates maintenance.