Built with D3.js v3 and jQuery, this interactive visualization presents education resource data as a zoomable treemap. The code uses `d3.layout.treemap` to hierarchically arrange rectangles by value, colored via `d3.scale.category20c`, with click-to-transition zooming between parent and child nodes. Data is loaded from a JSON array of entries containing subject, region, subregion, and count values, which the treemap aggregates and lays out recursively. The SVG renders responsive rectangles and a grandparent breadcrumb header, demonstrating a reusable template for hierarchical exploration.