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.
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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.
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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…
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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.
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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.