This bar chart displays the population of 30 countries in 2020, using a horizontal layout with country names on the y-axis and population values on the x-axis. The visualization uses D3 v5’s `scaleBand` and `scaleLinear` to position bars, while React components render the SVG elements. Data is loaded from a CSV file via `d3.csv` and formatted with `d3.format` to abbreviate large numbers, for example converting Gigas to Billions. Each bar includes a native SVG `<title>` tooltip showing the formatted population value.