This zoomable treemap displays hierarchical data through nested rectangles sized by value, allowing drill-down navigation to explore subregions. It visualizes Indian education statistics from a JSON file, grouping entries by region and subregion. The example uses d3.v3 with the d3.layout.treemap API and SVG rendering, implementing custom recursive layout and accumulate functions. Click transitions animate zooming between hierarchy levels, with an orange breadcrumb bar showing the current path and enabling navigation back to parent nodes.