Firmware is computer software that has been recorded in a chip that is installed in some kind of machine. It is used in everything from cell phones to microwaves ovens to your car. These programs are intimately tied to the hardware, so looking at the number of electrical engineers, which are the people who design the hardware, gives you a pretty good idea of the size of the field.
Computer programming is the more general classification, but that gets you mixed up with graphics designers working on web pages and office drones writing report generators. I could do that kind of thing, but I would have to make up an imaginary resume to appear qualified. People who are hiring these days are very leery of hiring anyone who does not have a list of qualifications as long as both arms and a leg.
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