An interactive SVG map of the world renders country boundaries in green with black outlines using D3.js and TopoJSON. The visualization loads geographic data from the World Atlas TopoJSON file and projects it with a Natural Earth projection via `d3.geoNaturalEarth1` and `d3.geoPath`. It uses `d3.json` to fetch the data and `topojson.feature` to convert it into GeoJSON, then appends `path` elements to the SVG.