A horizontal bar chart displays the populations of thirty countries in 2020, sorted by country name along the y-axis and ordered by population along the x-axis. The visualization uses React with D3 version 5, specifically `scaleBand` and `scaleLinear` for axes, and renders SVG rectangles. Data is loaded from a CSV file via the `csv` function, with tooltips formatted using D3's `format` function to show abbreviated population values. The chart includes styled axes with blue tick lines and gray tick labels.