This example displays a bar chart of population data for several countries, loaded from a CSV file. The bars are rendered as SVG rectangles, with a linear scale mapping population values to widths and a band scale mapping country names to vertical positions. The code uses D3 v6 methods such as `d3.scaleLinear`, `d3.scaleBand`, and `d3.axisLeft` to construct the visualization. The HTML page includes inline CSS and JavaScript, with the chart drawn entirely through D3’s selection and data-join pattern.