This choropleth map visualizes the global prevalence of HIV/AIDS among adults aged 15–49 in 2017, with countries shaded on a yellow-to-red sequential scale based on infection rates. Countries lacking data appear gray. The visualization uses d3.geoPath with a geoNaturalEarth1 projection to render world map features from TopoJSON, while d3.scaleSequential and interpolateYlOrRd map data values to colors. React manages the component state, fetching and joining CSV data with country codes to match each nation’s geographic ID.