This example displays a hierarchical tree of movie genres, from major categories like Action and Drama down to specific films such as Star Wars and Parasite. Each node is drawn as a colored circle with a text label, using a vertical layout with straight links. Built with D3 v7, it applies `d3.stratify` to construct the hierarchy from flat parent-child data and `d3.tree` to compute node positions, rendering the SVG output with unique colors from `d3.scaleOrdinal` and a custom legend.