PCB (Printed Circuit Board): It appears in almost every electronic device. If there exist electronic components a certain kind of equipment, which are set in various sizes of PCB. In addition to fix a variety of small parts, the main function of PCB is to provide electrical connections among the parts. As electronic devices become more complexity which requiring more and more electronic components, the intensity of circuit pattern and electronic parts on the PCB are also increasing simultaneously. Bare board (without any electronic components on it) is also often referred to as “Printed Wiring Board (PWB) “. The substrate of PCB is composed of insulated as well as non-pliable material. Small circuit wire as you can on the surface of laminate is copper foil, copper foil is covered on the surface of raw laminate, and being etched away in the manufacturing process, those part being left behind as a network of fine lines form the circuit pattern. These lines are called conductors (conductor pattern) or said wiring, which are used to provide electrical connections on the PCB for those components.