Does it describe the contents of the questions to which it is applied? and is it unambiguous?
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[plugins](https://stackoverflow.com/questions/tagged/plugins "show questions tagged 'plugins'") [tag wiki](https://stackoverflow.com/tags/plugins/info):

> 
> A plug-in (or plugin) is a set of software components that adds specific abilities to a larger software application. If supported, plug-ins enable customizing the functionality of an application.
> 
> 
> 

This description doesn't give us any real reason why we should use the tag, only what a plugin is by its definition.

Is the concept described even on-topic for the site?
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While a plugin pattern could be useful for the site, most of the questions are going to be either too broad or opinion based.

Does the tag add any meaningful information to the post?
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The only information this tag adds is that the question is about a problem with a plugin, this can in most questions also be made clear by the context of the other tags invoked.

Does it mean the same thing in all common contexts?
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No, because most people use this tag for the platform/language specific plugin, while in broad sense of the meaning it is still a plugin, there are significant differences between the implementations, and therefore you cannot be a [plugins](https://stackoverflow.com/questions/tagged/plugins "show questions tagged 'plugins'") expert.

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This tag should really be burninated because it is almost always misused when any kind of plugin is involved in the question, and therefore the tag should be replaced with more specific tags or removed altogether from questions.