This visualization displays a world map of the 2021 Human Development Index (HDI) values, coloring each country according to its score using a green sequential palette. It implements zoom and pan interactions with d3.zoom and shows a color legend with ordinal scales to interpret HDI ranges. The map uses d3.geoPath with a geoNaturalEarth1 projection, loads geographic data from topojson-client, and merges HDI values from the internet_users.csv dataset, with a tooltip showing each country’s score on hover.