This example demonstrates a zoomable world map with hover interactions, where countries change color on mouseover. It renders geographic features using d3.geoPath with a d3.geoNaturalEarth1 projection, and applies zoom behavior via d3.zoom to transform the map group. The map data comes from a TopoJSON file combined with a TSV file for country names, loaded through d3.json and d3.tsv. The SVG is styled with CSS for the country fills and hover effects.