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.
Pertaining to the process of revising content or tags to bring better clarity to a question or answer.
held to choose moderators for this Stack Exchange site.
for issues using GIS Stack Exchange in Mozilla's Firefox browser
For questions about the Winter Bash (or holiday hats) to celebrate the end of the year.
For issues regarding the help center of GIS SE.
to ask questions about this very site, a.k.a. GIS Meta. In some sense, the [meta] tag is Meta-GIS Meta Stack Exchange.
for questions dealing with moderator actions, pages, abilities or decisions.
Indicates that the post shares product or configuration change concepts during the Discovery phase. Open to receiving feedback from the Community preceding implementation.
For questions about, well, questions: how to ask, whether specific questions are appropriate, and so forth.