This bar chart displays the top 10 most populous countries from the United Nations World Population Prospects 2019 dataset, using horizontal bars ranked by population. The visualization is built with React and D3.js v5, where the `d3.csv` loader fetches the data, `d3.scaleBand` positions country labels along the y-axis, and `d3.scaleLinear` maps population values to bar widths. Both axes are rendered as SVG elements through custom React components, with the left axis listing country names and the bottom axis showing population ticks. The chart updates reactively once the data loads, displaying all country names and population magnitudes without additional interactivity.