This interactive choropleth map visualizes economic data across countries using a color scale, with a legend allowing users to filter countries by clicking on specific values. The map renders in SVG using d3.geoOrthographic projection and d3.geoPath, while the accompanying color legend enables selection that highlights matching countries and dims others. Data comes from a CSV file merged with world atlas TopoJSON via d3.csv and topojson.feature. Users can also zoom and pan the map using d3.zoom.