Daily COVID-19 deaths by country are plotted over time on a logarithmic y-axis, with each country shown as a line. Hovering over the chart highlights the nearest line and displays a tooltip with the country, death total, and date, using a Voronoi overlay built with `d3.Delaunay`. The data comes from the Johns Hopkins Coronavirus Dataset and is smoothed with a repeated averaging blur. The React-based visualization uses D3 scales, axes, and line generators, rendering to SVG.