This visualization displays world population density on a choropleth map, with a sidebar dropdown to select data from 1980, 2000, 2010, or 2022 and a table ranking the top ten most densely populated countries. It uses D3 v6 (d3.geoPath, d3.geoMercator, scaleThreshold) to render an SVG map from GeoJSON data, updating country fill colors on selection. A hover tooltip shows the country name and density value. Population density data comes from a CSV file linking country codes to values per year.