This choropleth map visualizes the global prevalence of HIV/AIDS among adults aged 15-49 for the year 2017, with countries shaded on a sequential yellow-to-red color scale based on infection rates. Regions lacking data appear in dark gray. The map uses D3’s `geoNaturalEarth1` projection and `geoPath` to render country boundaries and graticules from World Atlas TopoJSON data. React hooks load the CSV dataset and ISO country codes, while `scaleSequential` with `interpolateYlOrRd` maps prevalence values to fill colors.