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.
Unanswered questions are those questions which have no up-voted answers.
for questions about the user profile page, which contains a list of all the questions, answers, and an audit trail of the user's activity on the site.
for questions or issues surrounding login to this site.
"Design" refers to front-end elements, such as page layout, coloring conventions, etc.
for questions specifically about the process of asking questions on a Stack Exchange site.
for questions about the various user interface and email elements used to notify users of events on the site.
Indicates that the reported behavior is intentional and not subject to change
Indicates that the feature request or bug is something that is intended to be implemented or fixed, ideally in the near term.
Indicates that the feature request or bug is something that is intended to be implemented or fixed, but not in the near term.
Indicates that a change in functionality is currently under consideration, or needs further investigation.