This bar chart displays the population of the 15 most populous countries using a horizontal layout, with country names on the y-axis and population on the x-axis. The visualization is built with React and D3 v5, using `scaleBand` and `scaleLinear` for positioning, and renders SVG rectangles with tooltips on hover. Data is loaded from a CSV file and formatted with the `format` function, while axis ticks and gridlines are generated by custom React components.