A horizontal bar chart displays the top 10 countries by population in 2020, with each bar sized proportionally to population and labeled by country name. The chart uses React for the component structure and D3 v5’s `scaleBand` for the y-axis and `scaleLinear` for the x-axis, rendering bars as SVG `<rect>` elements. Data comes from the World Population Prospects 2019 CSV file, fetched with D3’s `csv` method, and the visualization updates after loading.