They connect the inner layers and stay hidden from sight. The buried vias have no paths to the outer layers. These vias are located in the interior region of the PCB. The other end of the hole cannot be seen once the lamination is done. Either the connection is from the top layer to a layer in the center or from the bottom layer to some layer in the interior region. Here, the hole doesn’t penetrate through the entire board but connects the PCB’s exterior layers to at least one interior layer. The hole penetrates from an exterior layer and ends at an interior layer. For PTH, the connection is established from the top to the bottom layer. The hole penetrates from the top layer to the bottom layer.
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