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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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used for questions that ask users to discuss an idea, concept, or problem in an abstract way. A discussion question may not necessarily have a clear-cut right or wrong answer and is often…
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A request for assistance with one of the site's features.
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You have an idea for a new feature on the site, or for a change to the existing functionality.
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used to write mathematics on Stack Exchange sites.
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Indicates a reproducible problem on the site that you believe is due to a mistake, malfunction, or programming error.
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keywords or labels that categorize and group your question with other, similar questions. If your post at meta is about suggesting new tags, choosing correct tags for some question, suggestin…
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when asking what is on- or off-topic on the main site, and why.
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when you want to draw attention to a specific question on the main site. For example, if you want to draw high-rep users to close/reopen/edit a question, if you want to discuss the…
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small addendums to each question or answer, intentionally limited in size and formatting.
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a core, fundamental Stack Exchange value -- we allow editing by registered and unregistered users (if peer reviewed).
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will be used to ask questions dealing with reputation.
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Indicates that the report has been resolved through the implementation of a feature or the fixing of a bug.
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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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for questions about answers on the main site. Consider using the accepted-answer tag if the question is about an answer that has been accepted.
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The process by which users can vote a question closed if it is off-topic or otherwise disallowed by the FAQ.
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Questions specifically about the process of asking questions on this site.
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the process of bringing a question, answer or comment to a community moderator's attention for any reason.
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the community's way of telling peers that their content can be improved. Downvotes on meta may have different meanings.
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for questions about questions, answers and comments that have been deleted, or nominated for deletion.
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referring to the process of identifying and closing questions that are exact duplicates of another question.
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aimed for discussions about etiquette: how to behave on the site and the chat.
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Users without full edit privileges can suggest edits to posts and tag wikis
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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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the primary way users gain reputation, and also how many items are sorted to the top.
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For instructions and guidance on closing or migrating questions, and the reasons for those closures.
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refers to all questions deleted from Stack Exchange sites. The tag 'specific-question' should also be used when referencing a specific question that has been deleted.
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The user interface elements and web pages that make up this site.
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For questions about built-in search functionality of this site and about searching this site using external search engines.
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awarded to encourage and incentivize positive community actions within the site.
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For questions concerning the management of tags on both the main site and meta. Common topics include the merging of tags, and making tags synonyms of one another.
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the answer the question owner thought best met their needs. Accepting is encouraged but never required. This tag is for *discussing* issues related to accepted answers, not indi…
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Questions about diamond (♦) moderators, their powers, and actions they have taken.
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for questions on Mathematics Stack Exchange policies
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Refers to user accounts either generically, or across the network.
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For questions concerning using images in questions, image hosting etc.
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intentional and not subject to change