This bar chart displays the top 10 most populous countries based on 2018 United Nations estimates, with population values in thousands. The visualization uses D3 v5’s `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` to render the SVG bars, while a custom tick formatter converts large numbers to readable abbreviations like “B” for billions. Axis labels and a title are added manually, and gridlines are drawn via `tickSize(-innerHeight)`. Data is loaded from a local CSV file, with the population column multiplied by 1000 during preprocessing.