This example shows a hierarchical tree of food categories, from “Food” down through “Fruit” and “Vegetable” to specific items like “Orange” and “Carrot.” It loads data from a local CSV file and builds the hierarchy using `d3.stratify()`, then lays it out with `d3.tree()`. The SVG rendering draws curved links via `d3.linkHorizontal()` and positions colored node circles and labels according to the computed tree coordinates.