Example of a plug-in: Adobe Flash. You didn't make it, the author of the website you're visiting didn't make it, the company that produced your browser didn't make it, so it's a 3rd party plugin.
As I've said before, I run with 3rd party plugins turned off, and only turn them on for specific sites. You wouldn't believe how fast some pages load when all the elaborate Flash stuff just doesn't happen!
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