This horizontal bar chart displays the population of the top 20 countries for the year 2010, using D3.js v5 within a React framework and rendering via SVG. The visualization is built with `scaleBand` for the categorical y-axis and `scaleLinear` for the numeric x-axis, with bars drawn as SVG rectangles. Population values are loaded from a CSV file using D3's `csv` function, formatted with `d3.format` to abbreviate large numbers (e.g., 'B' for billions), and include interactive tooltips showing the formatted population on hover. The chart includes styled blue tick marks and green bars, with axes labeled accordingly.