PCB, also called printed circuit board, is the provider of electrical connections for electronic components. According to the number of circuit boards, it can be divided into single panel, double sided plate, four layer, six layer and other multilayer circuit board.

(1) single panel: the most basic PCB, the parts are concentrated in one side, and the wires are concentrated on the other side. Because the wires only appear on one side of them.

(2) double sided board: both sides of the circuit board have wiring,however to use both sides of the wire, it is necessary to have proper circuit connection between the two sides. The bridge between such circuits is called via. Via is a small hole filled or coated with metal on the PCB. It can be connected with the wires on both sides.

(3) multilayer board: in order to increase the area that can be wired, multilayer boards use more single or double sided wiring boards.

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