This bar chart displays the 2020 population of 30 countries, ranked vertically with horizontal bars extending to represent population size. Built with React and D3 v5, the visualization uses `d3.scaleBand` for the categorical country axis and `d3.scaleLinear` for the numeric population axis, with a zero baseline. The data is loaded from a CSV file and formatted using `d3.format` to abbreviate large numbers. SVG rectangles render the bars, with tooltips showing exact population values on hover.