This horizontal bar chart displays population figures for the twenty most populous countries, with bars sorted by country name along the y-axis and population on the x-axis. Each bar includes a hover tooltip showing the formatted population value, and the chart is titled "POPULATION-2010" on the x-axis. Built with React and D3 v5, the visualization uses `scaleBand` and `scaleLinear` to map data, while `Marks.js` renders SVG rectangles for each bar, and `AxisBottom.js` uses custom formatting to convert values to billions with a "B" suffix. The data is loaded from a CSV file using D3's `csv` function.