This interactive tree diagram visualizes a hierarchical dataset of car brands and their parent companies, including Volkswagen, BMW Group, and Hyundai. The visualization uses the D3.js library's tree layout and diagonal link generator to render nodes and connections as scalable vector graphics (SVG). Users can click on nodes to expand and collapse branches through an animated update function that transitions nodes between states. The graph displays custom-styled blue nodes with violet borders and sky blue connecting links on a white background.