What is a PCB? The nervous system of electronic products.

The Printed Circuit Board (PCB) is an indispensable component in modern electronic devices.

It functions as the "nervous system" of electronic products, connecting and supporting all electronic components such as resistors, capacitors, and chips.
The primary function of a PCB is to allow electrical current to flow between various components through conductive pathways (copper traces), thereby enabling different circuit designs.

Common PCB materials include FR-4 (fiberglass fabric) and polyimide, among which FR-4 is the most widely used due to its excellent heat resistance and insulation properties.
From mobile phones and computers to automobiles and medical equipment, PCBs can be found in virtually all electronic devices.

Their stability and reliability have a significant impact on product quality and safety.