This example displays a hierarchical tree graph of TATA car models, organized into parent platforms and sub-brands. Rendered as SVG, it uses a custom dataset with parent-child relationships and d3.stratify to build the hierarchy, d3.tree to compute positions, and d3.v5 to create circular nodes with depth-based color coding and curved links. The graph shows the vehicle lineup from base platforms like ALFA and OMEGA down to individual models, with text labels beside each node.