A multi-line chart tracks cumulative global COVID-19 deaths over time by country, with a logarithmic y-axis filtering out countries below 10,000 fatalities. Hovering activates a Voronoi overlay, constructed with `d3.Delaunay`, to highlight the nearest line and display a tooltip with the exact date and death count. The React-based SVG visualization uses D3 scales (`scaleTime`, `scaleLog`), axes, and line generators, with data sourced from the CSSE COVID-19 time series on GitHub.