An interactive tree diagram displays the model hierarchy of Tata cars, organizing product families and their variants. The visualization divides the data into branches for ALFA, OMEGA, and multiple EV generations, with clickable nodes used to expand or collapse child elements. Rendered as SVG with animation, the layout uses D3.js libraries including `d3.layout.tree` and `d3.svg.diagonal` to position nodes and draw links. The tree transitions smoothly between states via D3's transition API, providing a static yet interactive exploration of the car model relationships.