This example presents a horizontal bar chart of the top 20 countries by 2010 population, using D3 version 5 within a React framework and rendered as SVG. The visualization maps country names to the y-axis and population values to the x-axis, with bars colored yellow and axis ticks styled in blue. The code constructs scales with `d3.scaleBand` and `d3.scaleLinear`, formats tick labels with `d3.format`, and organizes chart components into separate modules for the x-axis, y-axis, and data marks. Population data is loaded from a remote CSV via `d3.csv`.