Double-sided PCB Board has wiring on both sides. However, to use two sides of the wire, there must be a proper circuit connection between the two sides. Such "bridges" between circuits are called vias. A via is a small hole on a pcb, filled or painted with metal, that can be connected to wires on both sides. Because the double-sided board has twice the area of the single-sided board, and because the wiring can be interleaved (can be wound to the other side), it is more suitable for use on more complex circuits than single-sided boards.
Strictly speaking, the double-sided board is a very important pcb board in the circuit board. Its use is very large. It is very simple to see whether a pcb board is double-sided. I believe that my friends have a good understanding of single-sided boards. To be sure, the double-sided board is an extension of the single-sided board, which means that the circuit of the single-sided board is not enough to turn to the reverse side. Another important feature of the double-sided board is that it has vias. To put it simply, it is double-sided wiring, with lines on both sides!
A summary is: the board with double-sided wiring is a double-sided board! Some friends will ask, for example, a board has double-sided wiring, but only one side has electronic parts. Is such a board double-sided or single-sided? The answer is obvious, such a board is a double-sided board, but only parts are installed on the double-sided board.
