This visualization is an interactive Sankey diagram built with D3.js v4 that maps the flow of categorical car attributes (buying price, maintenance cost, doors, persons, luggage boot, safety) from the Car Evaluation dataset. It shows how records transition sequentially through these attribute columns, with node widths representing counts and colored by attribute category. The implementation uses custom D3 Sankey layout functions, the `d3.csvParse` and `d3.text` APIs for data ingestion, and `d3.drag()` for interactive node repositioning. The SVG-based rendering displays attribute titles above each column and uses color scales to differentiate categories.