This bar chart displays the population of the top 10 countries in 2020, using horizontal bars ranked by country name. The visualization loads CSV data from a GitHub gist and renders it as SVG through React components, with D3's `scaleBand` and `scaleLinear` handling the axes. Axis and bar styling are customized via CSS classes, and tooltips showing formatted population values in millions or billions are provided through SVG `<title>` elements.