A horizontal bar chart visualizes the total population for each income group in 2020, drawing from United Nations data. The visualization uses D3 v5 to create an SVG, with a linear scale for the population axis and a band scale for the categorical income groups. Population values are loaded from a CSV file, while the chart includes axis labels, tick marks, and a title, all styled through CSS. The bars are rendered as simple SVG rectangles filled with steelblue.