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The names of circuit boards include: ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high-frequency board, thick copper plate, impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board, printed (copper etching technology) circuit board, etc. Circuit boards play an important role in miniaturizing and visualizing circuits, as well as optimizing the layout of electrical appliances for mass production of fixed circuits. A circuit board can be called a printed circuit board or a printed circuit board, with English names such as (Printed Circuit Board) PCB, (Flexible Printed Circuit Board) FPC circuit board (FPC circuit board, also known as flexible circuit board). FPC circuit board is a highly reliable and excellent flexible printed circuit board made of polyimide or polyester film as the substrate. It has the characteristics of high wiring density, light weight, thin thickness, and good flexibility. It is also known as a flexible and hard combination plate. The birth and development of FPC and PCB have given rise to the new product of flexible and hard combination plate. Therefore, the combination of soft and hard circuit boards refers to the combination of flexible circuit boards and rigid circuit boards through pressing and other processes according to relevant process requirements, forming a circuit board with FPC characteristics and PCB characteristics.

Circuit boards can be classified into three major categories based on the number of layers: single panel, double-sided board, and multi-layer circuit board.

Firstly, on the most basic PCB, the components are concentrated on one side, while the wires are concentrated on the other side. Because the wires only appear on one side, this type of PCB is called a single-sided circuit board. Single panel manufacturing is usually simple and cost-effective, but its disadvantage is that it cannot be applied to overly complex products.

Double panel is an extension of single panel. When single-layer wiring cannot meet the needs of electronic products, double-sided panels are used. Both sides are covered with copper and have routing, and the wiring between the two layers can be conducted through vias to form the required network connection.

Multilayer board refers to a printed circuit board with three or more layers of conductive patterns and insulating materials sandwiched between them, and the conductive patterns are interconnected as required. Multilayer circuit board is a product of the development of electronic information technology towards high speed, multifunctionality, large capacity, small size, thinning, and lightweight.

If circuit boards are classified according to their characteristics, they can be divided into soft boards (FPC), hard boards (PCB), and soft hard junction boards (FPCB).