This example shows an interactive map of world countries that users can pan and zoom, with countries highlighted in red when hovered over. It renders a Natural Earth projection using D3’s `geoNaturalEarth1` and `geoPath` within an SVG. The map loads world geometry from TopoJSON via `world-atlas` and country names from a TSV file, merging them by ISO code. Zooming is handled with `d3.zoom` and `event.transform` on the entire map group, while each country’s `title` tooltip displays its name.