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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For questions concerning tag-synonyms.
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an editable page that briefly summarizes the topic of the tag and that may provide links to existing questions that are often useful to many people. Sometimes tag-wiki also includes short …
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the name currently used for the old meta site of MathOverflow, which is now hosted on http://mathoverflow.tqft.net/ In contrast to the current site it was not Q&A based.
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For questions about arXiv trackbacks.
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those questions which have neither an accepted answer nor answers with positive vote count. Note that our definition is strict!
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for questions regarding unregistered users.
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For questions about various userscripts and bookmarklets.
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A message displayed to alert the user to a problem or potential problem.