Tags

From Pvmwiki

Tags are basically just keywords that describe the content you have published. Tags are used a lot on blogs nowadays and they serve as an alternate method of browsing content. As articles get written, more and more tags appear in the 'tag cloud' and when users click on a certain tag, the system shows all articles related to that specific tag.

It's not a requirement for bloggers on the site, however the feature is enabled so if you know how to add tags, please feel free to do so. If not, the webmaster will go in and add tags that are relevant to the post.