This bar chart displays the populations of ten countries, with steel-blue bars that turn red and gain a blue stroke on mouseover while a text label appears showing the country name and its population in billions. The chart uses D3 v6's `scaleBand` and `scaleLinear` for axes, `axisLeft` and `axisBottom` for scales, and a custom `format-india` function for number formatting. Data is loaded from a CSV file via `csv()`, and the SVG renders responsively to the window size.