PCBs (printed circuit boards) have, more or less, become a very vital part of modern electronic equipment. In fact, if you were to disintegrate any electronic equipment in your house, the chances are that you are going to come face to face with one of myriad types of PCBs. A basic printed circuit board is comprised of a very large number of passive and active components. They are connected from side to side with traces on the board. It is wholly possible to develop very large circuits on small printed circuits boards with the availability of very small sized electronic components.