This interactive tree diagram maps the corporate ownership structure of major car companies, displaying a hierarchy that branches from a central "Car Company" node into brands like General Motors, Volkswagen, and BMW Group. The visualization uses D3.js tree layout and SVG diagonal links to draw the organizational chart, with collapsible node circles and labels. The code implements d3.layout.tree, d3.svg.diagonal, and animated transitions over 750 milliseconds to smoothly expand and collapse branches when users click on parent nodes.