This visualization shows worldwide COVID-19 total cases on a choropleth map, coloring each country red, orange, or green based on case thresholds. It uses d3.geoNaturalEarth1 and d3.geoPath to render the world.geojson features, while COVID data from a CSV is joined to country names. Hovering over a country reveals a tooltip with the exact total cases. The SVG remains responsive through CSS, and the map uses d3’s join pattern for efficient rendering.