Here's a short story:

When the board has no embedded components it is more correctly called a printed wiring board (PWB) or etched wiring board. However, the term printed wiring board has fallen into disuse. A PCB populated with electronic components is called a printed circuit assembly (PCA), printed circuit board assembly or PCB assembly (PCBA). The IPC preferred term for assembled boards is circuit card assembly (CCA), and for assembled backplanes it is backplane assemblies. The term PCB is used informally both for bare and assembled boards. 

Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. Rub-on dry transfers of common component footprints increased efficiency. Traces were made with self-adhesive tape. Pre-printed non-reproducing grids on the mylar assisted in layout. To fabricate the board, the finished photomask was photolithographically reproduced onto a photoresist coating on the blank copper-clad boards. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: How were PCB's first designed?
Guess: manually

Question: What is it called if a board has no embedded parts?
Guess: printed wiring board

Question: What is the acronym for that?
Guess: PWB

Question: Is there another name for it?
Guess: etched wiring board

Question: What is it called when there are electronic parts?
Guess: printed circuit assembly

Question: Are there other names for it?
Guess: printed circuit board assembly or PCB assembly (PCBA

Question: What is the IPC preferred term?
Guess: circuit card assembly

Question: What is the term preferred for backplanes?
Guess: backplane assemblies

Question: How are PCBs manually created?
Guess: creating a photomask on a clear mylar sheet

Question: How much bigger than it's real size?
Guess: two or four times

Question: What is used to make traces?
Guess: component pin pads

Question: What helps in the layout?
Guess: Pre-printed non-reproducing grids on the mylar

Now answer the following question in the same format.

Question: How is a board fabricated?

finished photomask was photolithographically reproduced onto a photoresist coating on the blank copper-clad boards.