This map visualizes the 2021 Human Development Index (HDI) by country, using a green color scale to represent index values. It uses d3.geoPath and d3.geoNaturalEarth1 to render world map outlines, with data from a Kaggle dataset. Hovering over a country displays its name and HDI value via a tooltip, and a color legend explains the value ranges. The visualization supports zoom and pan interactions.