What is a buried via on a PCB?

Unseen vias on either the top or bottom of a printed circuit board (PCB) are known as buried vias. It is used to connect layers of a PCB that are not on the surface, such as inner layers of a multi-layer PCB. Buried vias are typically smaller in diameter than surface vias and are typically created utilising laser drilling or etching processes. They can be utilised to decrease the size of a PCB and enhance  performance by minimising signal crosstalk between layers.

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