What is a Plug-In?

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A plug-in is a software extension that adds a specific feature to an existing software application. This makes a plug-in an important piece of software code that enables an application or program to do something it couldn’t by itself.

You’ve probably heard of plug-ins in the context of web browsers to add new features like virus scanners, for example. Ever enabled Adobe Flash Player or Microsoft Silverlight QuickTime Player on your internet browser? Yup – those are plug-ins.

One of the most popular plug-ins to download is Adobe’s Acrobat. This is a document presentation and navigation program that lets you view documents just as they look in the print medium.


Other plug-ins are available for different functions. There are plug-ins for social media networking, foreign language alphabets, and many other things.

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