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.
the keywords that help describe and categorize questions.
what questions are on- or off-topic and why.
if your question relates to synonymizing multiple tags.
to post questions regarding the new blog proposal.
those questions which have no up-voted or accepted answers.
Any two or more questions which cover the same topics and/details and can be answered by one of the existing questions.
Site policy refers to the various policies and measures that govern the site.
Questions about questions (how to ask, rules about, etc.)