A horizontal bar chart displays the population of 20 countries in 2010, with each bar’s length proportional to its population value. The chart uses React to render SVG elements, with D3’s `scaleBand` and `scaleLinear` mapping country names and population values to pixel positions. Data is loaded via `d3.csv` from a GitHub-hosted CSV file, and axes are built using custom React components. Tick labels are formatted with `d3.format` to abbreviate large numbers (e.g., converting “G” to “B” for billions).