This example demonstrates quarterly sales and profit trends from an 11-row Superstore CSV using four reusable D3.js v7 charts. A scatter plot of Sales versus Profit uses a Tableau10 color scale for categories, while a pie chart shows total sales share with arc labels and legends. The line and area charts aggregate data by UTC month using `d3.utcMonth` and `d3.rollups`, rendering paths with `d3.line` and `d3.area`. All charts use chainable accessor setters, `d3.select` joins, and SVG viewBox scaling, with hover tooltips on the scatter plot.