This bar chart displays the populations of ten countries, using a horizontal bar layout with a linear x-axis and categorical y-axis. It is built with React and D3, where D3’s `scaleBand` and `scaleLinear` handle positioning, and custom React components (`AxisBottom`, `AxisLeft`, `Marks`) render SVG elements for axes and bars. The data is loaded from a CSV via `d3.csv`, with population values scaled and formatted using `d3.format`. Tooltips and styled tick lines provide additional detail.