A horizontal bar chart displays the top 30 countries by 2020 population, with each bar’s length proportional to population and country names on the y-axis. The visualization uses React with D3 v5 to load CSV data via `d3.csv`, scale the values with `scaleLinear` and `scaleBand`, and render SVG rectangles through the `Marks` component. Axes are drawn with `AxisBottom` and `AxisLeft`, while tick labels are formatted using `d3.format` to abbreviate large numbers (e.g., “B” for billions). The chart's styling includes light green bars and blue axis lines.