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.

Type to find tags:
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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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You need help with the use of one or more of the site's features.
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You have an idea for a new feature, or for a change to the existing functionality.
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Indicates you've found an erroneous or unexpected behaviour in the system that needs to be fixed.
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Indicates that a feature request has been implemented, a bug has been fixed, or another type of request has been processed.
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keywords or labels that categorize and group your question with other, similar questions.
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points that a user gets (and loses) on StackExchange for activities, which allow more (or less) privileges.
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actually due to the existing design of the system and is not considered erroneous behaviour.
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