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.
designed to solicit opinions or best-practices on a particular topic, with the goal of reaching community consensus.
Tag to indicate concern with or guidance sought for an individual site question.
Questions about what topics and categories of question are on topic for RPG.SE.
for posts looking to raise meta discussions about specific closed questions, as well as for questions about the concept of a closed question in general.
For questions and discussions about RPG.SE policy, or policy on the meta site itself.
For discussion regarding the main-site [rules-as-written] tag, and handling RAW questions.
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For proposals to eliminate a tag by removing it from all questions using it (called burnination).