A circular packing visualization displays a hierarchical medical dataset as nested circles, with color encoding depth and interactive zooming into subtrees. Users can search by name via an input field with autocomplete, triggering animated zoom transitions on matching nodes. The implementation uses d3.pack for layout, d3.hierarchy for tree construction, and d3.interpolateZoom for smooth transitions, with data fetched from external JSON URLs. Search filtering relies on React state synced with the SVG elements, while rendering remains SVG-based.