This bar chart displays the population of three countries—China, India, and the US—using horizontal bars whose widths are proportional to population values. The visualization reads data from a CSV file via `d3.csv`, converts the population strings to numbers, and renders SVG rectangles using `d3.scaleLinear` for the x-axis and `d3.scaleBand` for the categorical y-axis. D3 v6 and React are used, with bars positioned and sized through the scales’ range and bandwidth methods.