This example displays a world map with country boundaries, rendered as an SVG using D3.js. The map uses an equirectangular projection and fills the Earth with a light blue color, while countries are colored green and shift to red on hover. It loads GeoJSON data representing boundary lines from a remote source, processes it with the TopoJSON library’s `feature` method, and draws the paths via `d3.geoPath`. The visualization relies on D3’s `select`, `json`, and `geoEquirectangular` functions.