The definition of Multilayer PCB
One single layer board has a single layer of conductive material.
Multi-layer boards have multiple layers of conductive material (almost always copper) with insulation between them.
And paths called 'vias' that allow different layers to conduct to each other.
What is multilayer PCB?
You may think this is very stupid question.
But for new PCB comers,What is multilayer PCB is basic question for their work.
Jim want to introduce multilayer PCB compare with single layer PCBs.
Multilayer PCB have different use area
Commonly in cheaper electronics you'll find single or double layer boards,
with expensive high end stuff (like cell phones or computer motherboards) using upwards of 9+ layers.
Multilayer PCB repair more difficult
With a single layer board, the conductive paths ("traces") are on the surface.
If there is an error on the board you can go in with a knife to cut the trace and you can solder wire to the surface traces to patch it to another location.
With a multi-layer board cut and patch is much harder.
Combine that with the cost and you have to be sure to get the multi-layer board right on the first go around.
You can think of the multi-layer board like some complex highway interchanges called stack interchanges.
If you have a couple highways coming together you have to stack bridges up one on the other so that everything can pass through the area.
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