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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designed to solicit opinions or best-practices on a particular topic, with the goal of reaching community consensus.
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For questions about the behavior or usage of tags and the tagging system (the keywords attached to question to categorize them). To request renaming/merging of specific tags, use [retag-request].
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For questions asking if a particular topic or work is appropriate and on-topic on this website.
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For the site's monthly topic challenge posts, inviting users to read and ask/answer questions about specific works of literature in a specific timeframe, or for questions about these topic challenges.
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when requesting changes to the tagging system: merges or synonymisations of existing tags, addition or removal of specific tags to large selections of questions, etc.
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For questions about asking questions on the main site.
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For questions about how to promote Literature Stack Exchange elsewhere.
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Questions asking for nominations for the best answers and/or questions submitted during a specified period.
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For questions about the quality of answers on the main site.
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For questions that pertain to a specific question.
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Questions about answers: how to answer, whether specific answers are appropriate, etc.
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For questions relating specifically to posts with the [story-identification] tag on the main site.
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Requests to remove a tag, known as 'burnination'.
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For questions about migration, the process by which questions can be transferred, together with their answers and comments, from one Stack Exchange site to another.
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Questions about the real-time, stateful web chat that is a part of every Stack Exchange site.
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For questions about spoilers and spoilertagging in posts on the main site.