A stylized world map visualizes countries as green regions with black outlines on a blue sphere, using D3.js v5 and TopoJSON. The code loads geospatial data from the world-atlas countries-110m.json file, converts it to GeoJSON features with the topojson `feature` function, and renders it into SVG paths via `d3.geoPath` with a `geoEquirectangular` projection. Hovering a country changes its fill to orange.