This bar chart displays the population estimates for the top 10 most populous countries in 2019, sourced from the World Population Prospects. The visualization uses a linear scale for the x-axis and a band scale for the y-axis, with bars rendered as SVG rectangles. The code leverages D3 v5 modules like `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` to construct the chart, including custom tick formatting that converts numbers to billions. Population values are parsed from a CSV file and multiplied by 1000 to reflect actual figures.