Single Layer PCBs have the electronic components on one side of the board and the conductor pattern on the other side. Multilayer PCBs can have the electronic components on the top side, the bottom side or both sides of boards and have one or more conductor patterns.
Single-layer or single-sided PCBs are typically used in simple electronics. They are cheap to manufacture and are often used in applications that demand high volumes such as calculators, radios, and printers.
Double-layer boards are necessary for moderately advanced technology including HVAC systems, power supplies, LED lighting, and automotive dashboard lighting.
Multi-layered boards delve into the territory of complex data storage, GPS technology, medical equipment, and satellites.
