This choropleth map visualizes world population by country, with countries colored according to their population values and tooltips revealing exact figures on hover. The visualization uses D3 v7's `d3.geoNaturalEarth1` projection and `d3.geoPath` to render TopoJSON world geography, while population data is joined to country shapes via a mapping between numeric IDs and ISO3 codes. A legend and interactive tooltip enhance readability of the population distribution.