A horizontal bar chart displays the populations of ten countries in 2020, sorted by country name along the y-axis and using a linear population scale on the x-axis. Built with React and D3 v5, the visualization uses `d3.scaleBand` for categorical positioning and `d3.scaleLinear` for the continuous population mapping, while `d3.format` transforms tick labels from gigabytes to billions. Data is loaded asynchronously from a CSV file via `d3.csv`. SVG rectangles render the bars, with hover tooltips showing formatted population values. Axis components are custom React functions, and styling is applied through CSS classes.