This visualization displays confirmed COVID-19 cases per country on a world map, using a natural Earth projection from the topojson library. The map shows circles sized by the square root of case numbers, with a legend explaining the scaling. It uses d3.select, d3.geoPath, and d3.scaleSqrt for rendering, and supports interactive zooming. Data is loaded from a CSV file, and the map is rendered as SVG with hover tooltips showing country names and case counts.