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plug-in
Sign in to saveAlso known as plugin, extension, snap-in, software plugin, add-on, software add-on, software module, addon
software component that adds a specific feature to an existing software application
A plug-in is a small software addition that you can install into a larger program to give it new features or abilities. Plug-ins matter because they let you customize your software without having to replace the whole program or wait for a major update from the company that made it.
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Mozilla Firefox displaying a list of installed plug-ins
In computing, a plug-in (also spelled plugin), add-in (also addin, add-on, or addon) or extension is a software component that extends the functionality of an existing software system without requiring the system to be re-built. A plug-in feature is one way that a system can be customizable.