This bar chart displays the populations of the world’s most populous cities, based on 2018 United Nations World Population Prospects estimates. The visualization uses D3 v5 with SVG rendering, employing `scaleLinear` and `scaleBand` to map population values to bar widths and city names to vertical positions. Axes are generated with `axisLeft` and `axisBottom`, while data is loaded asynchronously from a CSV file using `d3.csv`. Each bar’s width is proportional to its population value, with the chart ordered alphabetically by city name.