This bar chart displays the populations of 20 countries in 2010, ranked along a vertical categorical axis with horizontal bars. The visualization uses D3 version 5 within a React framework, rendering to SVG via React components. Data is loaded from a remote CSV using d3.csv, with population values scaled by 1000. Axes are generated using d3.scaleBand and d3.scaleLinear, while d3.format applies SI-prefix tick labels that convert billions to B. Each bar includes a native SVG title tooltip showing the formatted population value.