This horizontal bar chart displays the population of ten countries in the year 2000, sorted with the largest population at the top. Built with React and D3 v5, it uses `d3.scaleBand` for the categorical y-axis and `d3.scaleLinear` for the quantitative x-axis, rendering SVG rectangles. Data is loaded from a CSV file using D3’s `csv` function, and axis ticks are formatted with a custom SI prefix function that converts billions to 'B'.