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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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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Indicates that the report has been resolved through the implementation of a feature or the fixing of a bug.
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For questions about the behavior or usage of tags, which are 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 on this site, and why.
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Indicates you've found an erroneous or unexpected behavior in the system that needs to be fixed.
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Questions about the design of the site, whether it is a bug, feature-request or otherwise.
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You have an idea for a new feature, or for a change to the existing functionality.
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for requests to replace one tag with another existing tag. It also applies to requests that one tag should be merged into another, or simply abandoned.
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used to query the community on the specifics of a particular question asked on the main site or the meta site.
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For coordinating projects to help clean up the main site.
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intentional and not subject to change
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for questions about tag synonyms (how they work, who can create them, etc). Use [synonym-request] tag for tag synonym requests.
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For questions regarding the nature of a "question" on Web Applications Stack Exchange; e.g. how to ask, whether specific questions are appropriate, etc.
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the process of migrating off-topic questions from a Stack Exchange site to another.
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for general questions about questions that have been closed because they are off-topic or otherwise do not meet the criteria defined in the FAQ.
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Proposals for new entries for the FAQ repository on this site should use this tag.
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For questions about the /review path where users can view and act on posts by other users that the system thinks may need attention.
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For questions about the process of editing, how edits work, and other general inquiries about the edit system.
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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 instructions and guidance on closing or migrating questions, and the reasons for those closures.
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For questions about the flagging process, how flags are handled, etc.
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Questions about dealing with "meta tags", tags that don't categorize the question, and are undesirable.
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A request to add one tag as the synonym of another tag. Please be specific about which tag should be a synonym of which. Bidirectional synonyms and cycles are implicitly disallowed, so suggest wisely.
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Users without full edit privileges can suggest edits to posts and tag wikis.
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held to choose moderators for Stack Overflow and non-Beta Stack Exchange sites.
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Questions flagged as duplicate, and/or reasons to do so.
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the process by which users can vote to close a question. You gain the ability to cast close votes when you reach 3,000 Reputation.
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Questions about Web Applications Meta.
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awarded to encourage and incentivize positive community actions within the site.
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small addendum to each question or answer, intentionally limited in size and formatting, and are meant to be temporary.
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For questions about the promotion of the site and/or about attracting *new* users to visit and participate in Web Applications.
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for questions about suspected user spam, the spam flag or combating spam as a community.
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For questions about competitions on the site (originally relevant around the time Web Applications graduated), so this is unlikely to be of use on new questions.
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Questions about diamond (♦) moderators, their powers, and actions they have taken.