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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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the answer the question owner thought best met their needs. This tag is for discussing issues related to accepted answers, not indicating that a question has an accepted answer.
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For discussion about the explicitly commercial advertising that appears on this site (if any).
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Answer-invalidation involves editing a question in such a way that something addressed in an answer is lost. This is disallowed on Code Review as it disrupts the review process as specified in the He…
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for questions about answers: how to answer, whether specific answers are appropriate, and so forth.
Appending improvements involves adding improved code to a question, whether or not it came from an answer. This is disallowed on Code Review as it disrupts the review process as specified in the Help…
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for questions specifically about the process of asking questions on Code Review; e.g. how to ask, whether specific questions are appropriate, etc.
Questions relating to the suggestion or request for one or more new badges.
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awarded to encourage and incentivize positive community actions within the site.
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Tag for questions involving the banning of users.
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for the annual "Best of Code Review" awards.
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for discussions directly related to the progression of the beta.
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used in requests for adding one or more tags to the blacklist, preventing them from ever being recreated.
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for questions about the official mouthpiece of the Stack Exchange empire.
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a way to get additional attention for a question by offering some of your own reputation for great answers.
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Requests to have a tag "burninated" (or deleted) from the system. Use in case of uncertainty when requesting discussion, or when the popularity of the tag makes manual retagging followed by automatic…
Ceiling and floor of the number of characters you can enter into various slots.
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the real time, stateful web chat that's a part of every Stack Exchange site.
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Bots to run in Stack Exchange chatrooms
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a popup that lists available close reasons in order to vote to close a question. This tag is only for questions about the dialog itself.
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for general questions about questions that have been closed because they are off-topic or otherwise do not meet the criteria defined in the FAQ.
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for instructions and guidance on closing or migrating questions, and the reasons for those closures.
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for questions regarding the amount of code used or to be used in a post.
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small addendum to each question or answer, intentionally limited in size and formatting. Comments are second-class citizens.
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Indicates a post used for submitting and voting on Community Promotion Ads.
the new block that replaces the "Visit Meta" block that was before used on Stack Exchange sites.
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Use this meta-tag for posts related to the community-determined programming challenges that happen every now and then.
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a flag that can be applied to answers (and sometimes questions) which lowers the barrier for editing and prevents any rep gain/loss from voting.