A choropleth map visualizes global HIV/AIDS prevalence in 2017, with countries shaded along a yellow-orange-red sequential scale and gray indicating missing data. The visualization uses React with D3.js v7, employing `d3.geoNaturalEarth1` projection and `d3.geoPath` to render country shapes from TopoJSON world atlas data. HIV prevalence values are loaded from an IHME dataset and mapped to numeric country codes for accurate geographical association.