A Sankey diagram is a visualisation used to depict a flow from one set of values to another. Sankey diagrams allow you to show complex processes visually, with a focus on a single aspect or resource that you want to highlight. If your team is making a decision about energy, time, or money, then that’s a great time to consider a Sankey diagram. A Sankey diagram is the perfect chart to show the flow and relationships between the stages of a process.