A choropleth map displays the share of the population infected with HIV/AIDS for 2017, using a yellow-to-red sequential color scale. The visualization uses the Natural Earth projection via `d3.geoNaturalEarth1` and `d3.geoPath` to render country boundaries, graticules, and a sphere. Data from the IHME is merged with ISO country codes via `d3.csv`. Missing countries appear gray. The map is built with React and D3 v5, rendering as SVG with `scaleSequential` and `interpolateYlOrRd` for color encoding.