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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keywords or labels that categorize and group your question with other, similar questions.
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A specific question refers to a particular and individual question on the site. This tag is used to query the community on the specifics of a particular question asked on the main site or the meta sit…
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You have an idea for a new feature, or for a change to the existing functionality.
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when examining what is on-topic or off-topic, and why.
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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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for questions specifically about the process of asking questions on Code Review; e.g. how to ask, whether specific questions are appropriate, etc.
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for questions about site-policy. Any question that is about how the website should be used should use this.
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You need help with the use of one or more of the site's features.
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for questions about answers: how to answer, whether specific answers are appropriate, and so forth.
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Indicates that a request (usually a feature request) has been considered, but will not be implemented. Generally speaking, a developer will leave a comment as to why, or the community will come to con…
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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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Requests to have a tag "burninated" (or deleted) from the system. Use in case of uncertainty when requesting discussion, or when the popularity of the tag makes manual retagging followed by automatic…
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for instructions and guidance on closing or migrating questions, and the reasons for those closures.
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a core, fundamental Stack Exchange value; we allow editing by registered and unregistered users (if peer reviewed).
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fun! Use this tag for anything that suggests adding a new layer of gamification to the site.
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for discussions directly related to the progression of the beta.
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for questions about Code Review questions themselves. This can refer to things such as relevant feature requests, merging, and migration.
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the most frequently asked and answered questions on Meta.
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For questions regarding posts being moved to other sites as a means of maintaining proper organization based on subject.
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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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For questions about the flagging process, how flags are handled, etc.
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for questions regarding the amount of code used or to be used in a post.
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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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the process by which users can vote to close a question if it is off-topic or otherwise disallowed by the FAQ.
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for questions regarding off-topic questions, including whether or not a question is on-topic and what to do with off-topic questions.
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for questions about a specific answer to a question. Answers given to such questions might not be applicable in general.
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the primary way users gain reputation, and also how many items are sorted to the top.
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actually due to the existing design of the system and is not considered erroneous behaviour.
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for questions regarding the process of reviewing improved code over time.
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For issues regarding the help center of Stack Exchange.
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for issues of what is allowable or desirable in question titles.
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the real time, stateful web chat that's a part of every Stack Exchange site.
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small addendum to each question or answer, intentionally limited in size and formatting. Comments are second-class citizens.
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for questions referring to a non-Stack Exchange controlled entity.