This bar chart visualizes the 2020 population estimates for 30 countries, sorted by country name on the y-axis and population on the x-axis. The visualization uses React with D3 v5, leveraging `scaleBand` and `scaleLinear` for positioning, while `AxisBottom` and `AxisLeft` render tick marks and labels. Data is loaded via `d3.csv` from a GitHub gist, with population values converted from the raw CSV. SVG rectangles represent each country, with hover tooltips showing formatted population values in billions.