Devin Knight looks at the Sankey visual in Power BI:
In this module you will learn how to use the Sankey Power BI Custom Visual. The Sankey is a type of diagram that visualizes the flow of data between a source and destination.
Sankey diagrams are among the most information-dense diagrams out there. They aren’t general-purpose diagrams, but for someone willing to take the time to unpack them, they can be quite informative.