This bar chart visualization displays the total quantity of items sold across five countries, with data aggregated from individual order records listing each country’s cumulative sales figures. The visualization uses D3.js v7 to group raw data points by country, compute summed quantities via `d3.rollup` and `d3.sum`, then render the results as proportional bars scaled to the maximum value. The SVG-based rendering employs D3’s ordinal color scale to distinguish countries, with hover interactions that enlarge bars for emphasis. The chart presents the United Kingdom as the leading seller, followed by Italy, with Germany, France, and Australia showing lower volumes.