This example displays an interactive world map using D3 version 5 with an equirectangular projection. The map renders country boundaries from a TopoJSON world-atlas dataset, filling landmasses in light green with indigo borders against a sky-blue ocean background. Users can pan and zoom the map through D3’s zoom behavior, which applies transformations to the SVG. Hovering over any country changes its fill color to maroon. The code leverages `d3.geoPath`, `d3.geoEquirectangular`, and the TopoJSON `feature` method to convert and render geographic data.