This interactive tree diagram visualizes the hierarchical structure of ArcGIS point-of-interest (POI) categories, showing broad parent categories like Food and Travel and Transport branching into many specific child values such as "Sushi" or "Airport." The visualization uses a horizontal tree layout where nodes represent categories and connecting paths illustrate the parent-child relationships. It relies on D3 v5 APIs including `d3.tree`, `d3.hierarchy`, and `d3.linkHorizontal`, with zoom functionality enabled via `d3.zoom` and event handling. The SVG rendering displays category names as text labels with varying font sizes based on depth in the hierarchy. Data comes from the provided CSV file, which is processed and transformed into a hierarchical structure for display.