Different Types of Announcements

The announcement type has little to do with how the announcement looks, and more specifically determines the 'scope' of the announcement. By which we mean 'who' can see the announcement.

GlobalGlobal Announcements are shown to all authenticated Confluence users on all Confluence pages.

Anonymous users, not authenticated to your Confluence instance will not see Global announcements.
PublicPublic Announcements are only shown to anonymous users that have not authenticated to your Confluence instance. This type is also shown on all Confluence pages.

Logged in users will not see this type of announcement.