This horizontal bar chart displays the 30 most populous countries in 2020, with each bar’s length encoding population size. The visualization arranges countries vertically in descending order using a band scale and positions bars with a linear scale. Built with React and D3 v5, it renders SVG elements through reusable components for axes and marks. Population data is loaded from a GitHub-hosted CSV file, with values transformed from thousands to raw numbers. The chart includes formatted tick labels converting gigabytes to billions and styled axis lines and bars.