This interactive tree diagram visualizes the hierarchical relationships among muscle car manufacturers and their models, using data from a JSON file where nodes represent brands like Ford and Dodge, and leaf nodes show specific cars such as Mustang and Charger. Rendered as an SVG with D3 v3, the visualization uses collapsible nodes, color-coded node types, and animated transitions to expand or collapse branches on click, while a zoom and drag behavior allows panning and scaling. The layout is computed with `d3.layout.tree`, and tooltips provide additional details on hover.