This bar chart displays the 2020 population estimates for the first 30 countries in a CSV dataset, with each bar’s length representing population size along a linear scale. The visualization uses D3 v7 to load the data via `d3.csv`, filter the rows, and render SVG rectangles with `d3.scaleLinear` and `d3.scaleBand` for axes. Axis positioning is handled by `d3.axisBottom` and `d3.axisLeft`, while the chart is drawn entirely as SVG elements without additional interaction or animation.