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.
Used on the meta site for questions related to the scope of Genealogy and Family History Stack Exchange.
for discussions on how to publicise and promote this site.
Use for discussions about closing questions on Genealogy.SE
Use for discussion on the handling of duplicates on Genealogy.SE
For questions about the process of graduating from being a Beta to a Full Site