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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used for questions that ask users to discuss an idea, concept, or problem in an abstract way. A discussion question may not necessarily have a clear-cut right or wrong answer and is often…
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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 on the site, 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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to indicate question about how to type TeX/LaTeX equations on this site, and bugs regarding the TeX rendering (the MathJax engine). Here you'll find the [MathJax basic tutorial and qui…
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keywords or labels that categorize and group your question with other, similar questions. If your post at meta is about suggesting new tags, choosing correct tags for some question, suggestin…
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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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when examining what is on- or off-topic, and why.
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small addendums to each question or answer, intentionally limited in size and formatting.
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when you want to draw attention to a specific question on the main site. For example, if you want to draw high-rep users to closed/reopen/edit a question, if you want to discuss th…
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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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Questions about diamond (♦) moderators, their powers, and actions they have taken.
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the process of bringing a post to a community moderator's attention for any reason.
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aimed for discussions about etiquette: how to behave on the site and the chat.
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the primary way users gain reputation, and also how many items are sorted to the top.
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The process by which users can vote a question closed if it is off-topic or otherwise disallowed by the /faq.
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Questions specifically about the process of asking questions on this site.
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For instructions and guidance on closing or migrating questions, and the reasons for those closures.
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actually due to the existing design of the system and is not considered erroneous behaviour.
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awarded to encourage and incentivize positive community actions within the site. .
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Here, "design" refers to front-end elements, such as page layout, coloring conventions, etc. For questions about database structure, algorithms in the code, &c., please use the tag [architecture] inst…
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The user interface elements and web pages that make up this site.
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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 /review path where users can view and act on posts by other users that the system thinks may need attention.
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Refers to user accounts either generically, or across the network.
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referring to the process of identifying and closing questions that are exact duplicates of another question.
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the community's way of telling peers that their content can be improved. Downvotes on meta may have different meanings.
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Users without full edit privileges can suggest edits to posts and tag wikis
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Relating to the discussion and controversy around questions that are tagged, explicited stated as, presumed, or suspected to be homework questions (i.e. those given to a student in a formal course of …
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the answer the question owner thought best met their needs. Accepting is encouraged but never required. This tag is for *discussing* issues related to accepted answers, not indi…
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a lightweight markup language used across the entire Stack Exchange network for post formatting.
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held to choose moderators Mathematics Stack Exchange site.