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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You have an idea for a new feature, or for a change to the existing functionality.
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about choosing, using and merging tags and about tag synonyms.
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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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for meta questions and discussion topics concerning the site design.
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small addendums to each question or answer, intentionally limited in size and formatting.
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for questions about answers: how to answer, whether specific answers are appropriate, and so forth.
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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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Measurement of a user's contributions to the site, and the extent to which the community "trusts" that user with extra privileges
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for questions about, well, questions: how to ask, whether specific questions are appropriate, and so forth.
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referring to the process of identifying and closing questions that are exact duplicates of another question.
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for questions specifically about the process of asking questions on a Stack Exchange site.
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for question about etiquette in questions, answers and comments of this TeX site. This subject is closely related to the general Netiquette. This word might be looked up in the Wikipedia.
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the primary way users gain reputation, and also how many items are sorted when using filters.
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Where does the on/off-topic line lie for TeX-SX?
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For questions about fostering a sense of community amongst users of Stack Exchange sites.
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for instructions and guidance on closing or migrating questions, and the reasons for those closures.
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rewards to encourage and incentivize positive community actions within the site.
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Why should an answer be accepted, when and which one? This tag is for questions about such issues.
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the process by which users can vote to close a question if it is off-topic or otherwise disallowed by the FAQ.
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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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Lightweight, plain-text markup language used across the entire Stack Exchange network for post formatting.
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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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For questions or problems relating to the use of code in questions or answers on a site or the way that markdown works with code/preformatted text.
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For questions about the images used on StackExchange sites or about using images in your own posts.
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covers questions related to the policies of the Stack Exchange site.
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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 flagging process, how flags are handled, etc.
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moderated by users, depending on their reputation, and by moderators. For questions about moderation tasks, choose this tag.
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an abbreviation for minimal working example.
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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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the real time, stateful web chat that's a part of every Stack Exchange site.
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for questions about the built-in search functionality of this site powered by elasticsearch.