The prime goal of this article is to discuss about printed circuit boards. High concentration PCB seems to be at the summit of the record when advanced Printed Circuit Boards is discussed. Projects maintain to acquire more difficult and the customer expects the dimension of its products to reduce which drives require for circuit boards that are more closely populated. Designers are compulsory to packing more and more circuitry into less and less space. This creates important challenges for both the PCB fabricators and the CB assemblers.