This interactive network graph visualizes COVID-19 case statistics by continent and country, using a hierarchical tree structure. Nodes represent regions and countries, with leaf nodes displaying specific data points like total cases, deaths, and recoveries. Built with D3.js v6, the visualization employs `d3.forceSimulation` for physics-based layout, combining link, charge, collision, and centering forces, while `d3.drag` enables node repositioning. The data, loaded from `data.json`, is rendered as SVG elements with custom markers and arrowheads, all styled through an external stylesheet.