This page outlines the standards for creating and using tags and categories for blog posts on WiscWeb (Wordpress).
Categories and tags allow content authors and users to sort and view only the blogs posts with these specific identifiers. They are useful because then you can link from an email or advertisement to a filtered view of your blog.
Your department should have a standard set of categories and tags that are used. The web team recommends to periodically do a Category and Tag review of your blog instances. The web team can help you perform these audits.