This horizontal bar chart ranks the world’s 20 most populous cities by population, using orange hover highlights to reveal precise figures in millions. Built with D3’s `d3-selection` module, the visualization binds an array of city objects to SVG `<rect>` and `<text>` elements via `selectAll().data().join()`. Each bar’s width is scaled linearly from population data, while city names anchor on the left. Population values come from Wikipedia.