This visualization shows a hierarchical tree of vehicle types, from the root "Car" node down to three subcategories—Sedan, SUV, and Coupe—each branching to specific car models like Toyota and Honda. The tree is rendered using the D3.js v3 layout API with collapsible nodes that animate when clicked. Node rectangles are color-coded by type and connected by directional links with arrows, while tooltips provide additional label details. The layout accounts for collisions between nodes and supports zoom and drag panning through `d3.behavior.zoom`.