This visualization displays a world map using a Natural Earth projection, with each country rendered as a white SVG path with green borders using D3 v4’s `d3.geoPath` and TopoJSON data from `world-110m.json`. Country names from `world-country-names.csv` are joined to the geometry via their IDs. Hovering over a country changes its fill to grey, thickens its stroke, and shows a tooltip with the country’s name that follows the mouse cursor.