This example visualizes a hierarchical tree of automotive brands and their parent companies, such as General Motors, Volkswagen, and Stellantis, using an interactive SVG diagram. The code constructs the tree from an embedded JavaScript data object and renders it with the D3.js v3 layout API, specifically `d3.layout.tree` and `d3.svg.diagonal` for curved links. Animated transitions update node positions over 750 milliseconds, while orange links and steelblue node circles provide clear visual separation. Clicking a node toggles the expansion of its children, making the brand ownership structure explorable.