An add-on is either a hardware unit that can be added
to a computer to increase its capabilities or a program utility that enhances
a primary program. Less frequently, some manufacturers and software developers
use the term add-in. Examples of add-ons for a computer include cards
for sound, graphics acceleration, modem capability, and memory. Software
add-ons are common for games, word processors, and accounting programs.
The Microsoft Style Guide suggests using add-on for hardware only and
add-in for software utilities. Industry-wide, however, this guideline
does not seem to be widely followed.
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