Printed Circuit Board (PCB), also known as printed circuit board in Chinese, is an important electronic component, the support body of electronic components, and the carrier of electrical connection of electronic components. Because it is made by electronic printing, it is called a "printed" circuit board.

printed circuit board (PCB), the printed circuit board (PCB), is one of the important components of the electronic industry. Almost every kind of electronic equipment, from electronic watches and calculators to computers, communications electronics and military weapon systems, where there are electronic components such as integrated circuits, uses printed boards for electrical interconnection between the components. The printed circuit board is composed of an insulating base plate, a welding pad for connecting wires and assembling welded electronic components. It has the dual role of conductive line and insulating base plate. It can replace the complex wiring, realize the electrical connection between components in the circuit, not only simplifies the assembly of electronic products, welding work, reduce the wiring workload under the traditional way, greatly reduce the labor intensity of workers; And reduce the volume of the whole machine, reduce the cost of products, improve the quality and reliability of electronic equipment.

Printed circuit boards have good product consistency, it can use standardized design, which is conducive to mechanization and automation in the production process. At the same time, the whole printed circuit board after assembly and debugging can be used as an independent spare part to facilitate the exchange and maintenance of the whole machine products. At present, printed circuit board has been extremely widely used in the production of electronic products.

The earliest use of printed circuit boards was paper-based copper-clad printed boards. Since the advent of semiconductor transistors in the 1950s, demand for printed boards has skyrocketed. Especially the rapid development and wide application of integrated circuit, the volume of electronic equipment is getting smaller and smaller, the density and difficulty of circuit wiring is getting bigger and bigger, which requires the printed board to be updated constantly. At present, the varieties of printed board have developed from single panel to double panel, multi-layer board and flexible board. Structure and quality have also been developed to ultra-high density, miniaturization and high reliability degree; New design methods, design supplies and board materials, board technology constantly emerge.