This horizontal bar chart displays the populations of the top 20 countries in 2010, ordered by country name along the y-axis and population magnitude along the x-axis. Built with React and D3 v5, it uses `scaleBand` for the categorical y-axis and `scaleLinear` for the numeric x-axis, rendering data as SVG rectangles with tooltips showing formatted values. The chart loads CSV data from a remote GitHub repository and applies a custom tick formatter that converts large numbers to abbreviated units like "B" for billions. Axis labels and styling utilize CSS classes defined in the HTML document.