A world map drawn with D3.js shows country boundaries as SVG paths projected with the Natural Earth projection, with a dark sphere as the background. The visualization loads geographic data from the world-atlas TopoJSON file and renders each country as a filled path. Interactive mouseover and mouseout events change the fill color and stroke width of individual countries, providing immediate visual feedback. The code uses D3 v5 functions such as `geoPath`, `geoNaturalEarth1`, and `select` alongside the TopoJSON `feature` API.