A choropleth map of world countries, colored by economic income group, supports interactive exploration. The map uses a natural Earth projection and is rendered as SVG. A color legend allows selection and highlighting of specific categories, while zooming and panning are enabled via d3.zoom. Data is loaded from the World Atlas TopoJSON and TSV files, and the visualization is implemented with d3.geoPath and d3.scaleOrdinal. Hovering a country displays its name and value in a tooltip.