This interactive world map visualizes internet usage per country for 2015, with countries colored on a green scale from 0-20% to 80-100% and a legend indicating the percentage ranges. Hovering over a country reveals a tooltip displaying the country name and its specific internet user percentage. The visualization uses D3's `geoPath` and `geoNaturalEarth1` projection to render the map, with `d3.schemeGreens` for coloring and `d3.scaleOrdinal` for the legend. It loads GeoJSON data from a TopoJSON file via `topojson.feature` and supports zooming through D3's `zoom` behavior.