A line chart tracks smoothed daily COVID-19 death counts by country over time, using a logarithmic y-axis to accommodate wide numerical ranges. Hovering over any point reveals the country name, cumulative death total, and date, while highlighting that country’s entire trajectory in a thicker black stroke. The visualization relies on React for UI state and D3 v5 for scales, axis generation, and a Voronoi overlay (via `d3.Delaunay`) to capture mouse interactions efficiently. Data comes from the Johns Hopkins Coronavirus dataset, and the smoothing is achieved through repeated three-point moving averages defined in a custom `blur` function.