Since the invention of printed circuit technology by Dr. Paul Eisner in 1936, several methods and processes have been developed for manufacturing printed circuit board (PCBs) of various types.
The essential components of a PCB are
:
- the base, which is a thin board of insulating material, rigid or flexible, which supports all conductors and components. It provides mechanical support to all copper areas and all components attached to the
copper.
- the conductors, normally of high purity copper in the form of thin strips of appropriate shapes firmly attached to the base material. It provide not only the electrical connections between components but also solderable attachment points for the same
The term printed became popular because the conductive areas are usually generated by means of a printing process like screen printing or photo-engraving.

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it is not Paul Eisner, but Paul Eisler the inventor of PCB technology
best regards