This interactive tree visualization displays hierarchical data as collapsible boxes linked by labeled, arrowed connections. Built with D3.js v3 and jQuery, it uses `d3.layout.tree` with `transition` animations to expand and collapse nodes on click. The SVG layout supports zooming and panning via `d3.behavior.zoom`, tooltips, and colored node types from JSON data. The example loads data from `data2.json`, demonstrating dynamic sizing and a dark theme with styled rectangles and arrows.