This example displays a hierarchical tree of programming languages and related frameworks, organized into procedural, object-oriented, and scripting branches. Using React with D3.js v7, it renders an SVG visualization where nodes are color-coded by depth level, from the red root through blue and green intermediate categories to yellow leaves. The code employs `d3.hierarchy`, `d3.tree`, and `d3.linkHorizontal` to compute and draw the left-to-right layout, with data structured as nested JavaScript objects defining the language taxonomy.