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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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Questions about the licensing of content on Stack Exchange sites.
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For questions regarding locked posts and locking functionality. Diamond moderators can lock a question or answer.
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for questions or issues surrounding login to this site.
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for questions about low quality questions and answers that appear in the Low Quality Posts review queue.
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a lightweight, plain-text, markup language. It is used across the entire Stack Exchange network for post formatting (Questions, answers, wikis, chat).
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a JavaScript engine for displaying mathematics, available on some Stack Exchange sites.
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no Meta Meta Code Review, so questions about this very site just get this tag.
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For questions regarding posts being moved to other sites as a means of maintaining proper organization based on subject.
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for questions dealing with moderator actions, pages, abilities or decisions.
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Questions about diamond (♦) moderators, their powers, and actions they have taken.
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those users who may be new to the Stack Exchange Q&A format, and generally have a low reputation score.
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for questions about the various user interface and email elements used to notify users of events on the site.
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for questions regarding off-topic questions, including whether or not a question is on-topic and what to do with off-topic questions.
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an open standard that allows users to log in to many websites with a single set of third-party credentials.
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Nuggets that sit below a post to either reason its locked nature or a call for clarity in answers.
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for questions about the user profile page, which contains a list of all the questions, answers, and an audit trail of the user's activity on the site.
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for questions about Code Review questions themselves. This can refer to things such as relevant feature requests, merging, and migration.
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Every user's account profile has a section showing the recent reviews, revisions, comments, badges, posts (questions and answers), and accepts.
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For concerns regarding common issues in code often pointed out in reviews.
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points that a user gets (and loses) on StackExchange for activities, which allow more (or less) privileges.
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for requests to replace one tag with another existing tag. It also applies to requests that one tag should be merged into another, or simply abandoned.
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For questions about the /review path where users can view and act on posts by other users that the system thinks may need attention.
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RSS (an acronym for 'Really Simple Syndication') is an XML-based file format for providing well-defined syndicated content to "feed readers."
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when examining what is on-topic or off-topic, and why.
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for questions about the built-in search functionality of this site powered by elasticsearch.
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Questions also answered by the user asking, easily marked by the shaded user card attached to the answer.
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the way the main site is run and managed - processes, procedures, and routines that should be followed. Use this tag when you believe site-policy has not been applied correctly to a mai…
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for questions about suspected user spam, the spam flag or combating spam as a community.