The Full form of PCB is Printed Circuit Board. A PCB electrically connects and mechanically supports electronic or electrical components using conductive pads, tracks, and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate. It is basically an electric circuit made of a non-conductive material and in the form of a thin board that perfectly holds copper circuitry such as plastic, fiberglass, composite epoxy, etc. It has conductive paths printed on it to connect different electronic or electrical components, such as transistors, resistors, integrated circuits, etc.
PCBs are used in all computing and electronic devices such as digital cameras, televisions, cell phones, tablets, etc., including network cards, graphics cards, motherboards, and internal circuitry boards of hard drives. PCBs can be single-sided (one layer of copper), double-sided (two layers of copper on both sides of one substrate layer), or multi-layer (inner and outer layers of copper, alternating with layers of substrate). In 2014, the world market for bare PCBs exceeded $60.2 billion. In 2018, the Global Single Sided PCB Market Analysis Report estimated that the world market for PCB would reach $79 billion by 2024.