This world map visualizes geographic GDP data using a choropleth approach, coloring countries by their economic output. The example loads GeoJSON map data and renders it as SVG paths with `d3.geoPath`, while numeric GDP values drive a color scale. It uses `d3.json` to fetch the dataset and `d3.scaleThreshold` to map values to fill colors, with a tooltip providing details on hover. Built with D3 v6, the visualization demonstrates basic geographic mapping and data-driven styling in an SVG container.