A horizontal bar chart displays the top 30 countries by population in 2020, using light green bars ordered alphabetically by country name. The visualization employs D3.js v7 with SVG rendering, using `d3.scaleLinear` and `d3.scaleBand` for positioning, along with `d3.axisBottom` and `d3.axisLeft` for axes. Population values are formatted as billions on the x-axis, while the data originates from a CSV file hosted on GitHub, fetched asynchronously via `d3.csv`.