An interactive world map renders country boundaries as SVG paths using a Natural Earth projection via `d3.geoNaturalEarth1` and `d3.geoPath`. Country polygons, filled with a teal color, turn red on hover, while graticules and interior borders are drawn from `d3.geoGraticule` and a TopoJSON mesh. Data loads from the World Atlas TopoJSON file, and the React component updates selections dynamically.