This example displays an interactive world map using a natural Earth projection, with countries rendered as SVG paths and colored light green. The visualization supports zooming and panning via d3.zoom, and hovering over a country highlights it in red. It loads geographic data from the world-atlas TopoJSON and TSV files, merging country names via a reduce operation. The code uses d3.geoPath, d3.geoNaturalEarth1, and topojson.feature to project and draw the map.