A choropleth map colors the world by each country’s percentage of internet users in 2015, using a six-step green scale from `d3.schemeGreens`. Hovering reveals a country’s exact value in a tooltip, while the view supports interactive zoom via `d3.zoom` to bounding boxes. The map is drawn with `d3.geoNaturalEarth1` and `d3.geoPath` from TopoJSON data, with a color legend built from a custom `scaleOrdinal` scale. Internet usage data comes from a CSV of per-100-people statistics.