This choropleth map visualizes global population by country, joined to geographic boundaries through ISO-3 codes. The map uses a quantized color scale (`d3.scaleQuantize`) with the YlOrRd sequential scheme, rendering countries in seven bins from light to dark orange, while countries without population data appear gray. Built with D3 v7, the visualization loads local GeoJSON and CSV files, projects the geometry using `d3.geoNaturalEarth1()` and draws paths via `d3.geoPath`. Hovering over a country highlights its border and displays the country name and population in a tooltip, with a legend below the map explaining the quantized color bins.