This example combines bar and line charts to compare sales and profit across seven months, with bars encoding sales and a monotone line tracking profit. The SVG visualization is built with D3 v7, using `d3.scaleBand`, `d3.scaleLinear`, and `d3.line` with `d3.curveMonotoneX`. Interactive tooltips appear on bar and dot hover via mouse events, while gridlines, axis labels, and a custom legend clarify the dual-series data loaded from a CSV file.