This tab displays a table of all tags in the selected tag group. For each tag, the number of its uses is displayed. If you click the icon next to a tag, a list of links to documents tagged with the tag will be displayed. After clicking the icon in the header of the Actions column, a context menu is displayed, offering options for export of listed data to various types of files.
Detailed information about the Tag groups and the Tags module can be found in Developer's Guide -> Modules -> Tags.