A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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for questions about a specific answer to a question. Answers given to such questions might not be applicable in general.
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For topics regarding only a specific language or set of related languages.
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A specific question refers to a particular and individual question on the site. This tag is used to query the community on the specifics of a particular question asked on the main site or the meta sit…
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for questions about the entire network of Q&A sites that make up the Stack Exchange network.
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runnable inline code samples. Currently HTML, CSS, and JavaScript are supported. Use this tag for bug reports, feature requests, and discussions explicitly relevant to these snippet…
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Questions about sizes and other quantities of Stack Exchange sites, e.g. number of questions, GB/day transferred, etc.
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Users without full edit privileges can suggest edits to posts and tag wikis.
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when you are experiencing issues when using the site.
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For questions about real world stackexchange / code-review branded items.
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A request to add one tag as the synonym of another tag. Please be specific about which tag should be a synonym of which. Bidirectional synonyms and cycles are implicitly disallowed, so suggest wisely.
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For questions about the syntax highlighting performed inside code blocks on Stack Exchange sites.
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keywords or labels that categorize and group your question with other, similar questions.
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for questions about tag synonyms (how they work, who can create them, etc). Use [synonym-request] for tag synonym requests.
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an editable page that briefly summarizes the topic of the tag and that may provide links to existing questions that are often useful to many people.
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for questions referring to a non-Stack Exchange controlled entity.
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for issues of what is allowable or desirable in question titles.
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A programming tool or software development tool is a computer program that software developers use to create, debug, maintain, or otherwise support other programs and applications.
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about the top 7 question list on the Stack Exchange blog.
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For questions about internet trolls and trolling on Stack Exchange sites.
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Tweeting the "interesting" and "hot" things to Twitter via the integration of bots.
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those questions which have no up-voted answers.
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used when asking questions about undeleting questions/answers.
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for questions specific to upvotes, the community's way of telling peers that their content was clear and helpful. Up-votes on the meta sites may have different meanings.
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Refers to user accounts either generically, or across the network.
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The user interface elements and web pages that make up this site.
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User retention refers to keeping a user who has come to our site, coming back again and again.