This chart visualizes global HIV/AIDS prevalence among adults aged 15-49 for the year 2017, using a sequential color scale from yellow to red to indicate severity, with countries lacking data highlighted in red. Built with React and D3 v5, it renders an SVG map using a natural Earth projection via `d3.geoNaturalEarth1` and `d3.geoPath`, overlaying graticules and country borders from TopoJSON data. The prevalence values are loaded from a CSV file and mapped to each country by name, with a sequential scale (`d3.scaleSequential` and `interpolateYlOrRed`) determining fill colors.