What is Printed Circuit Board Assembly (PCBA)?

A printed circuit board (PCB) refers to a fully assembled board that contains all the necessary circuitry to go into an electronic device, whereas a printed wiring board (PWB) is devoid of components and is used in electronics that do not require complex functionality.
.
*Source: https://absolutepcbassembly.com

A system board or motherboard is the primary printed circuit board (PCB) of a system, whereas smaller ones that plug into the slots on the mainboard are termed boards or cards.

*Source: https://www.yourdictionary.com

A circuit board assembler prepares printed circuit boards (PCBs) by soldering electronic components onto them. Reading wiring diagrams, following sample boards, selecting electrical components, and finishing the boards with hand tools are all part of this job.

*Source: https://www.ziprecruiter.com

Mass production of PCBs can be achieved at a lower cost. They’re re-workable, widely available, and have excellent shelf life. PCBs also provide low electronics noise, are compact in size, and save wire. Inspection time is reduced because PCBs eliminate the probability of error. In addition, a PCB board takes less time in assembling a circuit as compared to the conventional method.

*Source: https://www.ecstuff4u.com