Bar Chart
This example displays population data for ten countries as a bar chart, with each country’s value encoded by the height of a rectangle. The chart is rendered as an SVG using D3 v5, with data loaded from a CSV file via `d3.csv`. The code uses `d3.select`, `d3.scaleLinear`, and `d3.max` to set up the visualization, while `d3.enter` appends the rectangles. The bars are currently fixed at 300 by 300 pixels, and the population values are multiplied by 1000 before rendering, though the axis and scaling are incomplete.