Buildup -PCB or Board Build-up: A PCB is defined by the PCB designer with a number of copper layers in a well define sequence. The pattern in each copper layer combined with the drill patterns and the copper plating of these drilled holes, form an electrical net that is responsible for connecting the pins of components to other pins of other components. The sequence in which these copper layers are defined is called the PCB Buildup, PCB Build-up, Board Buildup or Board Build-up. The printed circuit board manufacturer will fabricate the PCB board as per the Buildup. See Stack-up,or Extra Press Cycles.