This interactive tree diagram displays the hierarchy of muscle car manufacturers and their models, branching from a central "Muscle Cars" root through Ford, Dodge, and their respective vehicles. Built with D3 v3, it renders the structure as an animated SVG tree where nodes can be clicked and expanded or collapsed. The visualization uses the `d3.layout.tree` API to position nodes, with custom styling for different node types and zoom-and-drag interaction enabled through `d3.behavior.zoom`. The underlying data comes from a `Tree.json` file containing the nested hierarchy.