This visualization displays world countries on a natural Earth projection, with each country filled in light green and highlighted red on hover. The map is rendered as SVG using D3’s `geoNaturalEarth1` projection and `geoPath`. Country boundaries come from a TopoJSON world-atlas file, while names are joined via a TSV file keyed by ISO numeric codes. Users can pan and zoom the map using D3’s `zoom` behavior, which applies a transform to the map group.