This bar chart displays the top 20 countries by population from a CSV dataset, using horizontal bars to encode population values along a linear scale. The visualization is built with React and D3 v5, where D3’s `scaleBand` and `scaleLinear` handle the axis scales, and React renders the SVG rects, axis ticks, and labels. Data is loaded asynchronously via `d3.csv` from a remote GitHub gist, and the chart includes blue gridlines and text annotations for readability.