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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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allowed on this site or not.
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something that is written in reply to a question.
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Site-specific or free-form close reasons that appear under the heading “off-topic”
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indicates a post used for submitting and voting on Community Promotion Ads, while the `advertising` tag is to be used for discussion on these ads and to handle “Crypto.SE self-…
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