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 that may not necessarily have a clear-cut right or wrong answer and are often subjective. If your question isn't a bug report, feature request, or request for assistance, or question with a …
You need help with the use of one or more of the site's features.
Indicates that the report has been resolved through the implementation of a feature or the fixing of a bug.
For questions about the behavior or usage of tags, which are keywords or labels that categorize and group your question with other, similar questions.
when examining what is on-topic or off-topic on this site, and why.
Indicates you've found an erroneous or unexpected behavior in the system that needs to be fixed.
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.
used to query the community on the specifics of a particular question asked on the main site or the meta site.
Questions about the design of the site, whether it is a bug, feature-request or otherwise.
You have an idea for a new feature, or for a change to the existing functionality.
For questions regarding the nature of a "question" on Web Applications Stack Exchange; e.g. how to ask, whether specific questions are appropriate, etc.
for requests to replace one tag with another existing tag. It also applies to requests that one tag should be merged into another, or simply abandoned.
Questions about diamond (♦) moderators, their powers, and actions they have taken.
For coordinating projects to help clean up the main site.
Indicates that the reported behavior is intentional and not subject to change
for questions about tag synonyms (how they work, who can create them, etc). Use [synonym-request] tag for tag synonym requests.
Questions about how moderation works on Web Applications. About: how to moderate; particular moderation events; moderator pages; abilities; decisions and such like.
for instructions and guidance on closing or migrating questions, and the reasons for those closures.
"Migration" is the process of migrating off-topic questions from a Stack Exchange site to another.
Elections are held to choose moderators for Stack Overflow and non-Beta Stack Exchange sites.
For questions between the start of the public beta 2010-Jul-07 and the site graduation 2010-Sep-30 that were mainly intended to discuss the site workings and evaluate the site health.
For questions about the /review path where users can view and act on posts by other users that the system thinks may need attention.
Use for questions between the start of the private beta 2010-Jun-30 and the public beta 2010-Jul-07 that were mainly intended to discuss the site scope and tone and for discussing these questions.
The 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.
Voting to Close is the process by which users can vote to close a question. You gain the ability to cast close votes when you reach 3,000 Reputation.
for questions specifically about the process of asking questions on this site.
for questions about answers: how to answer, whether specific answers are appropriate, and so forth.
For questions about the process of editing, how edits work, and other general inquiries about the edit system.
Users without full edit privileges can suggest edits to posts and tag wikis.
Questions about dealing with "meta tags", tags that don't categorize the question, and are undesirable.
Questions about Web Applications Meta.
Proposals for new entries for the FAQ repository on this site should use this tag.
For questions about the flagging process, how flags are handled, etc.
Questions flagged as duplicate, and/or reasons to do so.
Comments are small addendum to each question or answer, intentionally limited in size and formatting, and are meant to be temporary.