This D3 Choropleth Map visualizes countries colored by income group using a natural Earth projection and world atlas TopoJSON data. The map uses an ordinal color scale with a spectral scheme, while a semi-transparent legend with circles and text labels displays the income categories. Hovering highlights countries in black and reveals tooltips showing both country name and economy type. The visualization supports zooming and panning through d3.zoom, with the map rendered as SVG paths generated by d3.geoPath.