This line chart shows cumulative COVID-19 deaths over time for multiple countries, using a logarithmic y-axis to accommodate the wide range of values. A Voronoi overlay, built with `d3.Delaunay`, enables mouse interaction, highlighting the nearest data point and displaying a tooltip with the country name, death count, and date. The chart uses `scaleTime` and `scaleLog` from d3.v6 within a React framework, rendering as SVG. Data comes from the CSSEGISandData COVID-19 GitHub repository.