This bar chart displays the 2018 population estimates for the top 10 most populous countries, with data from the United Nations World Population Prospects. It uses D3 v5 with SVG rendering, leveraging `d3.scaleLinear` for the x-axis and `d3.scaleBand` for the categorical y-axis, while customizing axes with `d3.axisBottom` and `d3.axisLeft`. The code applies custom tick formatting via `d3.format` to abbreviate large numbers (e.g., converting billions to "B"). Data is loaded from a local CSV file using `d3.csv`.