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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for questions relating specifically to the use of JavaScript on the Stack Exchange sites. Do not use this tag to ask about general JavaScript problems
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For posts about security issues centered around Stack Exchange. If you think you found a serious security vulnerability, please report it on the Security page found at https://stackexchange.com/about/…
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Content posted as an answer that doesn't actually answer the question at hand may be flagged "Not an Answer". Note *bad* answers are not eligible for this kind flag.
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For questions which focus on the live refresh features such as vote updates and new edit, answer, and comment notifications.
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For issues with how Stack Exchange sites look or work that are specific to Firefox.
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For questions related to user privacy.
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For issues with how Stack Exchange sites look or work that are specific to Google's Chrome browser.
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for questions about Stack Exchange RSS feeds (existing or proposed) and the bot in chat that posts messages when preselected RSS feeds are updated
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fetched and displayed on the Stack Exchange network. This is not for general Gravatar support inquiries.
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processed and rendered by the system.
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is used for questions relating to how information is displayed to Stack Exchange users.
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off topic on the site it was asked may be migrated to a different StackExchange site as part of being closed as "off topic", if the users voting to close felt it was good enough to …
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A feature of StackExchange chat, "oneboxing" automatically inlines links that are posted on a single line by themselves.
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a JavaScript engine for displaying mathematics, available on some Stack Exchange sites.
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The new navigation system, in beta test as an opt-in feature on Stack Overflow, Meta Stack Overflow and Meta Stack Exchange
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The flagging summary page shows a summary of the flag history for currently logged-in user.
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Questions about the live Markdown preview of posts as they're being typed.
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For questions about the badges awarded for specific tags.
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The component of the SE post editor that allows users to upload images to i.stack.imgur.com and display them in the post.
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Newsletter service (also called 'Digest'), introduced in July 2011, dishing out the top posts of a Stack Exchange site
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Stack Exchange's own OpenID provider, used for "log in with Stack Exchange" and potentially used for logging into other OpenID consumers.
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is for questions about being notified of Stack Exchange events by email.
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For questions about timestamps that appear in notices and tooltips upon hovering those notices.
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manner of conducting oneself in regards to the characteristics/expectations of Stack Exchange
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Some changes to questions, such as edits or receiving new answers, will "bump" them back onto the site's front page where the changes can be vetted by other users. **Do not use this tag to bump questi…
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is for questions related to policies of Stack Exchange.
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Discussions of the Code of Conduct (CoC), the replacement/revision of the Be Nice policy.
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Indicates that the feature request or bug is something that is intended to be implemented or fixed, but not in the near term.
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answers that are barely more than a link to another page.
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For questions about old questions.
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For questions about the copyrights of the Stack Exchange sites themselves or about the posting of copyrighted material by users.
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For discussing spelling-related edits, asking about preferred spellings, or reporting spelling problems on the site itself.
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Locking a question prevents answering, editing, commenting, voting, closing, and reopening. Answers must be locked separately and may still be voted upon. Only diamond moderators may lock posts.
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The "Private Beta" period of a new Stack Exchange site is a limited time period during which only users who have expressed interest in the site's proposal can participate.
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Reverts a post to the previous edit version, if any exists.
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a subset of privileges available to moderators and users with high reputation