This tree graph visualizes a three-level eCommerce product hierarchy, from top-level categories like Electronics and Fashion down to specific product lines. Each level is color-coded by its type, with categories in blue, subcategories in green, and product lines in red. The layout uses D3.js v7 with the `d3.tree()` algorithm to compute positions for the hierarchical data. Nodes and links are rendered as SVG elements, with circle sizes varying per level to visually distinguish the taxonomy.