This interactive map displays global hypertension prevalence among adults aged 30–79 using 2019 WHO data, coloring countries from green (low) to red (high) via d3.scaleSequential and interpolateRdYlGn. Country boundaries render with d3.geoNaturalEarth1 and d3.geoPath, while d3.zoom enables pan and zoom. Hover tooltips report prevalence rates, estimated affected populations, and region. The React app loads CSV health data alongside TopoJSON world geometries, with animations smoothing country transitions.