Making a Bar Chart
This example shows a horizontal bar chart of population counts for ten countries, with bars rendered as SVG rectangles and a categorical y-axis labeling each nation. The visualization relies on D3 v5 utilities including `csv` for parsing the `data.csv` file, `scaleLinear` and `scaleBand` for mapping population values and country names to pixel positions, and `axisLeft` for generating the country labels. Data values are converted from thousands to full numbers before rendering, and bars are styled with a steelblue fill.