This bar chart displays the population of 20 countries for the year 2010, ranked from largest to smallest along a horizontal axis. The visualization uses React with D3 v5 to render SVG elements, leveraging `d3.csv` for data loading from a GitHub repository and `d3.scaleBand` and `d3.scaleLinear` for positioning. Tick marks are styled in blue, with bars filled in light green. A tooltip appears on hover via the SVG `<title>` element, and the axis label is formatted using `d3.format`.