A horizontal bar chart displays the top ten most populous countries for 2020, based on UN population data loaded via `d3.csv`. Using React and SVG within a D3 v5 framework, the visualization separates concerns by organizing reusable components for rendering axes and marks. The chart applies `d3.scaleBand` for country categories on the y-axis and `d3.scaleLinear` for population on the x-axis, with the bottom axis presenting population values and left axis showing country names.