Group Dashboards allow users in the same group to share dashboards.
All users in the same group can view, create, and edit dashboards for that group.

This allows users to have both private and shared dashboards.

Example:
The user "karen" is in two groups: "server team" and "storage team".

Karen can decide where she wants to pin the graph - to her private dashboard or to the group dashboard.
Karen can also pin one graph to multiple dashboards in different groups.