A multilayer PCB is a type of circuit board that consists of multiple layers of conductive material separated by insulating layers. The layers are bonded together with heat and adhesive to create a single board. Multilayer PCBs are used in electronic devices where space is limited, and a high density of components is required.

The number of layers in a multilayer PCB can vary from two to several hundred, depending on the complexity of the circuit design. Each layer can be used to route signals, power, and ground connections, allowing for more efficient use of space and improved signal integrity.

Multilayer PCBs are commonly used in applications such as computers, telecommunications equipment, medical devices, and automotive electronics. They offer several advantages over single-layer PCBs, including higher component density, improved signal quality, and reduced electromagnetic interference.

Designing and manufacturing multilayer PCBs requires specialized knowledge and equipment, and is therefore more complex and expensive than producing single-layer PCBs. However, the benefits of multilayer PCB often outweigh the additional cost and complexity, making them a popular choice for many electronic devices.

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