This example displays an interactive world map using D3.js to visualize countries with a graticule sphere. It loads geographic data from the world-atlas TopoJSON and TSV files, rendering country boundaries through `d3.geoPath` with a `d3.geoNaturalEarth1` projection. Hovering highlights countries in red, while the `d3.zoom` API enables pan and zoom interactions. The SVG output uses CSS for styling, with tooltips showing country names via D3's `select` and `append` methods.