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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for questions dealing with moderator actions, pages, abilities or decisions.
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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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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 regarding the design of the Stack Exchange websites; e.g., for issues with the layout. For questions about the user interface elements (inputs, checkboxes, etc), use the 'us…
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For questions about the user interface elements (inputs, checkboxes, etc) that make up this site. For questions about the design of elements, use the 'design' tag.
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for questions about the GIS Stack Exchange blog (to which any community members may contribute).
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allowable or desirable in question titles
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