This horizontal bar chart displays the 20 most populous countries in 2020, with bars extending left-to-right from a shared baseline. The visualization uses D3 v7’s scaleBand and scaleLinear to map country names to y-axis positions and population values to bar widths, rendered as SVG rectangles in React. The data is loaded from a remote CSV, with tick labels formatted using D3’s format function, converting values to billions. The chart includes styled axes and a population label, with hover tooltips provided by native SVG `<title>` elements.