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.

Questions, concerns, or suggestions about a tag or about the way tags are used on our site.
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when examining what is on-topic or off-topic, and why, and how to deal with off-topic questions.
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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.
For questions regarding the nature of a "question" on Cross Validated; e.g. how to ask, whether specific questions are appropriate, etc.
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Questions about answers: how to answer, whether specific answers are appropriate, and so forth.
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Questions about tag synonyms (how they work, who can create them, synonym suggestions etc).
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Comments are small addendum to each question or answer, intentionally limited in size and formatting.
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Questions dealing with moderator actions, pages, abilities or decisions.
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For questions about the process of editing, how edits work, and other general inquiries about the edit system, used in editing questions, answers, tag wikis...
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Peer voting on questions and answers is the primary way users gain reputation, and also which items are sorted at the top.
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The process of identifying and closing questions that are exact duplicates of another question
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Questions related to policies and guidelines of the Stack Exchange sites.
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"Migration" is the process of moving threads from one Stack Exchange site to another.
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Reputation is 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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A request to reopen a closed question, or receive further explanation of why it was closed.
Questions with no answers, or with answers that have zero score or less and none of these is accepted
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Elections are held to choose moderators for non-Beta Stack Exchange sites
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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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The users' engagement within the Cross Validated Stack Exchange site
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For R related topics such as: scope, migration, markdown and guidance about how to ask/answer on the main site
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Mechanisms for displaying mathematical notation.
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"Design" refers to front-end elements, such as page layout, coloring conventions, etc.
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The scope of statistics software-related questions on Cross Validated
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For issues with ambiguous/suboptimal tags that require manual reorganization (i.e. cannot be resolved by creating a tag synonym or deleting a tag).
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For proposing and discussing new tags.
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Etiquette is the norms and standards of accepted behavior and politeness in our community
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Tag wiki excerpts are the most visible portion of tag wikis. They're shown when hovering over a tag, on the Tags page, and in the autocomplete suggestions when adding tags.
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A bounty is a way to get additional attention for a question by offering some of your own reputation for great answers.
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Discussion and controversy around questions that are explicitly stated as, presumed, or suspected to be homework questions, or other routine questions from a course or a textbook. They are tagged with…
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For questions about the process and etiquette of deleting existing tags.
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