PCB circuit board
PCB is printed circuit board.It electrically connects electronic components with conductive tracks, pads, and other characters etched from copper sheets laminated onto a non-conductive substrate.The components (capacitors, resistors and active devices) are generally assemblied on the PCB board, which is also called PCBA(PCB+Assembly+Componments).
PCBs usually include single layer board, double layers board and multi-layers board. Conductors on different layers are connected with the vias. Multi-layers PCBs could have higher component density.
Printed circuit board is used in all electronic products,like air conditions, ATM, elevator, led lights,military equipments,and so on.Producing PCB requires specification and circuit board design(gerber file, drawing, and prototype). Manufacturing PCB is cheaper and faster than PCB Assembly, because PCBA need to mounted and wired componments.