Multilayer PCB (Printed Circuit Board) refers to a type of PCB that consists of multiple layers of conductive traces and insulating material stacked together. Unlike single-layer or double-layer PCBs, which have only one or two layers of conductive material, multilayer PCBs provide increased design flexibility and complexity by incorporating multiple layers.
    In a multilayer PCB, the layers are interconnected using vias, which are small plated holes that allow electrical connections between the different layers. These vias can be through-hole vias, which traverse through all the layers, or they can be blind vias, which connect one or more inner layers but do not traverse the entire board, or buried vias, which connect inner layers without being exposed on the outer layers.
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