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Usage guidance, also known as a tag wiki excerpt, is a short blurb that describes when and why a tag should be used on this site specifically.
Every question asked on Stack Exchange can have up to five tags that categorize the question.
Meta sites have tags that need to be present in the question, which are bug, support, discussion and feature-request; there are also tags that can be added only from moderators, such as faq, featured, and status-declined, which are shown with a red background.
For more information see the section on tagging in the FAQ.
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Every question on any other Stack Exchange site, must be tagged with at least one tag.
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