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.

stackexchange.com provides a way to monitor activity across multiple sites in the Stack Exchange network using customizable filters.
513 questions
For discussion about the explicitly commercial advertising that appears on this site (if any), as well as the Community Promotion Ads which are voted on by users of each site.
507 questions
held to choose moderators for all graduated sites and some long-term beta sites.
available to users with a reputation of 10,000 or higher.
493 questions
those questions which have no up-voted or accepted answers.
487 questions
For issues regarding the help center of Stack Exchange.
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Hot Network Questions in the right-hand sidebar, the “hot” tab on each site, and on stackexchange.com.
475 questions
For questions about the public lists of changes made to posts by a site's users. They are available for questions and answers by clicking the "edited X min ago" link, and on tag wikis as "history" and…
466 questions
The global inbox contains information from across the entire network about notifications regarding posts and comments you've made, from answers to your questions to @replies to your comments.
456 questions
The standard editor for Stack Exchange posts, which supports a live preview of Markdown syntax.
448 questions
Questions about sizes and other quantities of Stack Exchange sites, e.g. number of questions, GB/day transferred, etc.
445 questions
for issues of what is allowable or desirable in question titles. For questions about window/tab titles of Stack Exchange pages, use the [window-title] tag instead.
442 questions
For questions about any of the emails sent from Stack Exchange sites to their users.
442 questions
about the quarterly creative commons data dumps of all public data in the Stack Exchange network Q&A sites.
437 questions
blocked from asking new questions, or posting new answers.
For questions about the syntax highlighting performed inside code blocks on Stack Exchange sites.
426 questions
for questions about the bookmark question feature - indicated by the bookmark icon under the voting arrows on a question. Previously known as "favorite" questions. For questions about favo…
424 questions
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.
424 questions
a set of tags that can be marked by a user. The questions that have favorite tags will be highlighted, and can be monitored using Tag Sets.
417 questions
when examining what is on-topic or off-topic, and why.
415 questions
For questions related to the sort orderings of questions, answers, and other lists on SE sites.
405 questions
Questions relating to the suggestion or request for one or more new badges
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For questions about the Stack Exchange API. Consider checking the API documentation and the Stack Apps site before posting your question here, it might have been asked before already.
380 questions
For questions regarding display names and what is allowed in them.
367 questions
Flags that have been declined by a community moderator or other trusted members of the community.
362 questions
Use with [meta] to request that a tag here on Meta Stack Exchange be removed. Use in case of uncertainty when requesting discussion, or when the popularity of the tag makes manual retagging prohibitiv…
349 questions
User accounts can be temporarily banned ("suspended") by ♦ moderators for violation of the site rules. Use this tag for any questions related to user suspensions. Do not use this tag to appeal a suspe…
349 questions
For questions about the user named Community ♦ present on Stack Exchange sites.
348 questions
for questions about the Stack Overflow blog, the place for official company communications as well as essays, opinions, and advice on the act of computer programming.
345 questions
The process by which high-reputation users and moderators can vote to delete a post from the site.
336 questions
For questions about adapting Stack Exchange to the needs of users from a specific cultural, linguistic or geographical background.
335 questions
For general questions about the Winter Bash (or holiday hats) celebration at the end of the year. Please consider using the year-specific variation, e.g. [winter-bash-2018] if it's solely about this y…
331 questions
regarding flagging comments as rude or offensive, no longer needed, or in need of moderator intervention. Also, for questions regarding the number of flags of a certain type required for automaticall…
331 questions
Use it for questions about user accounts that have been deleted or the process of that deletion.
330 questions
the act of casting many upvotes or downvotes on the posts of a specific user without proper reason. Also known as voting fraud.
324 questions
Questions also answered by the user asking, easily marked by the shaded user card attached to the answer.
323 questions
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