This example visualizes a hierarchical software project structure using a tree layout, showing modules, features, and tasks as colored nodes. It uses D3.js v7 with the `d3.tree` and `d3.hierarchy` APIs to compute the layout from a static JSON data object, then renders the structure as an SVG. Links are drawn as horizontal paths using `d3.linkHorizontal`, while nodes are colored by type via CSS classes, with text labels positioned left or right of each circle.