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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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when examining what is on-topic or off-topic, and why (i.e scope of the site).
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Questions about the visual design of Unix & Linux.
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for questions about tag synonyms (how they work, who can create them, etc).
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For questions about reputation, 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 asking for guidance to help reopening a closed question or requesting a question to be re-opened after a revision.