A multi-line chart displays cumulative COVID-19 deaths over time for each country, with a logarithmic y-axis and a dashed reference line marking a specific death count. The visualization loads data from a GitHub-hosted CSV via `d3.csv`, flattens the country time series, and renders SVG paths using `d3.line` with `curveNatural`. React manages the component structure, while `d3.scaleTime`, `d3.scaleLog`, and axis generators handle positioning and tick formatting.