This visualization shows a hierarchical tree of car brands, grouping companies like Volkswagen, BMW Group, and Hyundai with their subsidiaries such as Audi, Rolls Royce, and KIA. The diagram uses D3.js version 3 to compute the layout and render interactive SVG nodes and links, with click events that trigger smooth transitions for expanding or collapsing branches. Styling applies blue circles, violet strokes, and skyblue links, while text labels identify each brand.