This choropleth map displays the global distribution of universities, using a blue sequential color scale where darker shades represent higher counts and gray indicates missing data. Built with D3 v7, it projects country boundaries from a TopoJSON world atlas onto an SVG canvas using `geoNaturalEarth1()` and `geoPath`. University counts from a local CSV file populate a lookup table, mapping country names to values that drive the fill color. Interactive tooltips appear on mouseover, revealing the country name and its university count via `d3.select` and DOM manipulation.