This HIV/AIDS choropleth map visualizes the percentage of the population aged 15-49 infected with HIV for the year 2017, using a yellow-orange-red sequential color scale to indicate severity. Countries without data appear in grey. The visualization uses d3.geoNaturalEarth1 and d3.geoPath to render the world map, with graticules and country interiors drawn for context. React manages the component state, while d3.csv fetches the HIV prevalence data from the IHME dataset and d3.json loads the World Atlas TopoJSON.