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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A tag for questions that may not necessarily have a clear-cut right or wrong answer and are often subjective. If it's not a bug, feature-request or request for assistance, it is probably a discussion.…
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for proposals of new features on the Stack Exchange network, or requests for a change to an existing feature.
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A request for assistance with one of the site's features.
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indicates a reproducible problem on the site that you believe is due to a mistake, malfunction, or programming error.
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A feature request has been implemented, a bug has been fixed, or a request has been processed.
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Questions specific to stackoverflow.com should now be asked on meta.stackoverflow.com.
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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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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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small addenda to each question or answer, intentionally limited in size and formatting and intended to prompt clarifying edits.
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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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For questions regarding the nature of a "question" on Stack Exchange sites; e.g. how to ask, whether specific questions are appropriate, etc.
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For questions about the flagging process, how flags are handled, etc.
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the real time, stateful web chat that's a part of every Stack Exchange site.
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for question regarding the design of the Stack Exchange websites, e.g. for issues with the layout.
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Users without full edit privileges can suggest edits to posts and tag wikis.
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indicates that the specified behavior is intentional and not subject to change or correction.
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A service (now called Jobs) offered by Stack Exchange that allows programmers (and others) to find jobs, and employers to find great programmers (and others). Not supported here anymore; please ask ne…
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for questions about answers: how to answer, whether specific answers are appropriate, and so forth.
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awarded to encourage and incentivize positive community actions within the site.
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for questions about the user profile page, which contains a list of all the questions, answers, and an audit trail of the user's activity on the site.
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Peer voting on questions and answers gives users most of their reputation, and also usually controls how posts are sorted to the top.
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to be used for the Official Stack Exchange application only. The application is available in the Google Play store, for Android 4.0 and up only. When posting bug reports, please specify th…
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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 on graduated sites, and a lesser amount is needed o…
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for questions about the built-in search functionality of this site powered by elasticsearch.
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indicates that the feature request or bug will not be implemented or fixed at the present time.
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the Stack Exchange Network staging zone. It's where groups of experts come together to build new Q&A sites that work just like Stack Overflow. Area 51 has its own discussion site - `discuss…
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a way to get additional attention for a question by offering some of your own reputation for great answers.
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for questions about the entire network of Q&A sites that make up the Stack Exchange network.
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Don't know where to ask your question on the Stack Exchange Network? Give as much detail as possible about the question you'd like to ask, and the community will help you find the appropriate site. S…
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for questions specific to down-votes, the community's way of telling peers that their content can be improved. Down-votes on meta site have different meanings.
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a lightweight, plain-text, markup language. It is used across the entire Stack Exchange network for post formatting (Questions, answers, wikis, chat).
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For questions about the user interface elements (inputs, checkboxes, etc) that make up this site. For questions about the design of elements, use the design tag.
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used to query the community on the specifics of a particular question asked on Meta Stack Exchange.
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for the process of identifying and closing questions that have the same possible answers as another question because they are essentially the same.
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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.