This bar chart displays the top 10 most populous countries using United Nations World Population Prospects 2019 data. The visualization uses React and D3 v5 with SVG rendering, employing `scaleBand` for the categorical y-axis and `scaleLinear` for the population x-axis. The code implements custom `AxisBottom` and `AxisLeft` components, with `Marks` rendering population bars as rectangles. A `format('.2s')` function converts large numbers to abbreviated labels (e.g., "B" for billions), while CSS styling with the Poppins font gives the chart its stylized appearance.