The Subscribed NewsGroups window displays the NewsGroups that you have selected to be kept aware of new articles. A NewsGroup is a category of messages that (should) relate to some topic.
There are many thousands of NewsGroups, and not all News Servers (ISPs) offer all NewsGroups. You may manually enter the name of a NewsGroup you are interested in viewing, or in combination with the Full NewsGroup and New NewsGroup windows, Subscribe to additional NewsGroups.
If your ISP does not support a particular newsgroup in the Subscribed NewsGroups list, it will be marked with a '?' in the first column of the display. You may select such a group, but the only action that may be performed is to UnSubscribe.