What is multilayer PCB board?

Multilayer PCB is a circuit board that has more than two layers. Unlike a Double-Sided PCB which only has two conductive layers of material, all multilayer PCBs must have at least three layers of conductive material which are buried in the center of the material.

Multi-layer PCBs are often used in various professional electronics such as computers, mobile phones, heart monitors and much more. Multi-layer PCB fabrication consists of laminating more than two conductive layers together and there can be various amounts of layers, depending on the application requirement. Having more layers inside the circuit board allows more circuitry and wiring for more complex applications. For example, mobile phone printed circuit boards can have as many as 12 layers as they are very complex devices.