Broad sense: printed circuit boards are equipped with resistors, capacitors, IC and other electronic components, and the products are electrically connected by soldering. Generally we also call it as PCBA.
Narrow sense: refers to the circuit board which has no components installed, only graphics circuit.
The name of this kind of product originates from the conductive graphics circuit board formed by screen printing process.
In 1942, Dr. Eisler, a British doctor, initiated the application of etch-resistant ink patterns on the insulating substrates covered with copper foil by screen printing. This pattern is the conductive circuit to be formed, and then etched the copper foil which was not covered with ink patterns (it was a chemical method), and the remaining lines are obtained.
During World War II, this method was widely used in the military electronics field in the United States, and has been developing to various factions, such as laser engraving lines, photographic printing lines and so on.
Dr. Eisler is known as the father of printed circuits.
Printed Circuit Board for Civil: Television, Electronic Toys, Camera, etc. (Consumer electronics)
Industrial PCB: computers, communication equipment, instrumentation, etc.(Equipment)
Printed Circuit Board for Military
Used in automobiles, desktop computers, etc.
For mobile phones, laptops, etc.
For digital cameras, hand-held instruments, etc.
Paper Substrate: Phenolic Paper, Epoxy Paper, etc. ---Cheaper Kinds
Glass Cloth Substrate: Epoxy Glass Cloth Substrate, PTFE Glass Cloth Substrate and so on ---The most productive kind nowadays
Synthetic Fiber Substrate: Epoxy Synthetic Fiber Substrate, etc.
Metal Core Substrate: Aluminum Substrate, Copper Substrate --- LED for Street Lamp Lighting, Battery Driving Vehicle, etc.
Ceramic Substrate:Telecommunication Base Station
In terms of structure/process: (represented by rigid pcb classification)
Single side board
Toys and old color TV sets
Double sided board
Automobile and other applications nowadays
Multilayer and High-rise PCB
Computers, telecommunication base stations, etc.
High Density Interconnect Board (HDI Board)
Mobile phones, tablets, helmet-mounted stereo glasses, etc.
Other new processes...
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