This horizontal bar chart displays the population of 20 countries in the year 2000, ranked from largest at the top to smallest at the bottom. The visualization uses D3.js v7 with an SVG rendering approach, employing `d3.scaleBand` for the categorical country axis and `d3.scaleLinear` for the population values. The code builds the chart modularly through separate components: `Marks.js` draws light green rectangles, while `AxisBottom.js` and `AxisLeft.js` generate the axes with custom tick formatting that converts millions to "B" notation. Data is loaded asynchronously from a GitHub-hosted CSV file using `d3.csv`.