This example presents an animated scatter plot of the Iris dataset, cycling through different x-axis variables every two seconds. It uses a reusable chart module built with D3 v7, employing `scaleLinear`, `extent`, and `axisBottom`/`axisLeft` to render axes and data points as SVG circles. The code also includes a D3 pie chart visualization of Amazon Books sales by author, using `d3.pie` and `d3.arc` with a `title` element for hover details. Both charts draw from external CSV data sources.