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.
Requests to have a tag "burninated" (or deleted) from the system. Tags need to meet specific requirements to be removed. See the info page for this tag for full details on criteria
For questions about the design of the site. Using this tag will ensure that the designers will see any bugs or feature requests.