A: It is in its simplest form a WikiWord placed somewhere in a WikiPage to identify the page as one of many pages having some common characteristic. It usually exists, not to link you to a page, but to identify the group of pages (found by BackLinks) indicated by the tag.
To those who have come recently to this wiki, most of the people who have made named contributions to the wiki are no longer reading it regularly, or at all. So asking them questions will not be useful. Those who are around now may be able to help you. -- JohnFletcher