This interactive sankey diagram visualizes the car evaluation dataset (cars.data), showing flows between six categorical features—buy, maint, door, person, lug, and safety—and the final class outcome. Users can drag column headers horizontally to reorder features and drag individual nodes vertically to explore the hierarchy. Hovering over links displays the count of records passing between each pair of categories. Built with D3 v5, it uses `d3.sankey` for layout and `d3.drag` for interactions, rendering SVG paths with stroke-opacity for flow emphasis.