Multiple layers make it easy for the PCB traces to route by jumping over from one layer to another to complete the path. Hence many complex circuits can be routed easily.
Also the demand for compact electronic devices boosts the need for multiple layers PCB.
In PCBs with 4 or more layers, supply and ground is separated. This offers isolation between supply and ground pins and hence avoids short circuit.
Read More: Multilayer PCB
#PCB Design
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