This choropleth map visualizes the global prevalence of HIV/AIDS among adults aged 15-49 in 2017. Countries are colored on a yellow-orange-red sequential scale using d3.scaleSequential with interpolateYlOrRd, with gray indicating missing data. The map uses d3.geoNaturalEarth1 projection, d3.geoPath, topojson features for country boundaries, and a geoGraticule overlay. Data comes from IHME prevalence statistics loaded via d3.csv, rendered as SVG paths in a React framework.