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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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designed to solicit opinions or best-practices on a particular topic, with the goal of reaching community consensus.
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keywords or labels that categorize and group your question with other, similar questions.
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For questions regarding the creation, modification, or removal of tag synonyms.
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Questions and discussions about the scope of
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A site cleanup project to improve tags on questions.
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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 requests to replace one tag with another existing tag. It also applies to requests that one tag should be merged into another, or simply abandoned.
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For questions/discussion about promoting Android Stack Exchange.
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feature. Not for questions about changing tag synonyms.
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For questions which focus on a particular question (either from here on Meta or the main site), rather than discussing a "class" of questions generally.
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Discussion about what should be included in the parent site's FAQ page.
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For questions about the user interface elements and web pages that make up this site.
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