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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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keywords or labels that categorize and group your question with other, similar questions.
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for questions related to determining what is in scope (on-topic) and out of scope (off-topic) for this site (GIS Stack Exchange).
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For questions about, well, questions: how to ask, whether specific questions are appropriate, and so forth.
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for instructions and guidance on closing or migrating questions, and the reasons for those closures.
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Pertaining to the process of revising content or tags to bring better clarity to a question or answer.
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The process of identifying and closing questions that are duplicates of another question
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Use for questions related to using Comments against Questions and Answers
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held to choose moderators for this Stack Exchange site.
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for questions about any of the review queues
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for questions dealing with moderator actions, pages, abilities or decisions.
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a 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 the GIS Stack Exchange blog (to which any community members may contribute).
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Badges teach new users how Stack Exchange works and encourages activities that are positive to the community. They are assigned automatically by the system network-wide and questions about them are be…
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allowable or desirable in question titles