This horizontal bar chart displays the top 30 most populous countries in 2020, sorted in descending order with population values formatted in millions along the x-axis. The visualization uses React with D3 v7 scales and SVG rendering, fetching its CSV data from a GitHub repository with fallback sample data if the request fails. Bars are rendered as SVG rectangles using the `scaleBand` for country positioning and `scaleLinear` for population values, with axis components built through custom React functions for ticks and labels.