How Dashboards are organized
Dashboards have pages that display dashlets and each dashlet holds a report from either Designer or Visualizer. Plus, you can create key performance indicator (KPI) widgets directly in Dashboards.
Dashlets have display properties including title and border. Dashlets also provide drill-across capability that links a report to another dashboard.
Dashboards group into collections for logical organization.
Dashboards have themes so that you can apply your company's branding elements, including logo and colors.
This image shows the different aspects of a Dashboard page in Edit mode: