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A (usually small) piece of software that adds features to a larger piece of software. Common examples are plug-ins for
the Netscape browser and web server. Adobe Photoshop also uses plug-ins.
The idea behind plug-ins is that a small piece of software is loaded into memory by the larger program, adding a new
feature, and that users need only install the few plug-ins that they need, out of a much larger pool of possibilities. Plug-ins
are usually created by people other than the publishers of the software the plug-in works with.
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