Flexible Printed Circuit Board, also known as "FPC", is a printed circuit made of flexible insulating substrate, which has many advantages that hard printed circuit boards do not have. For example, it can be freely bent, wound, folded, can be arbitrarily arranged according to the spatial layout requirements, and can be arbitrarily moved and expanded in a three-dimensional space, thereby achieving integration of component assembly and wire connection. The use of Flexible PCB can greatly reduce the volume of electronic products, and is suitable for the development of electronic products in the direction of high density, miniaturization, and high reliability. Therefore, Flexible PCB has been widely used in aerospace, military, mobile communications, laptop computers, computer peripherals, PDAs, digital cameras and other fields or products.

Flexible PCB also has the advantages of good heat dissipation and solderability, easy assembly, and low overall cost. The design of soft and hard combination also compensates for the slight shortage of flexible substrate in the bearing capacity of components.

Flexible PCB are available in single-sided, double-sided and multi-layer boards. The substrate used is mainly a polyimide copper clad laminate. The material has high heat resistance and good dimensional stability, and is formed into a final product by pressing with a cover film having both mechanical protection and good electrical insulation properties. The surface and inner conductors of the double-sided, multi-layer printed wiring board are electrically connected to each other through metallization.

The functions of Flexible PCB can be divided into four types: Lead Line, Printed Circuit, Connector, and Integration of Function. The purpose is to cover computers and computer peripherals. Auxiliary systems, consumer livelihood appliances and automobiles.