This bubble chart shows sales performance by product, plotting Profit against Revenue where the size of each circle represents Units Sold. Built with D3 v7, it renders as SVG using `d3.scaleLinear` for the x, y, and bubble-size scales, `d3.axisBottom`, and `d3.axisLeft`. The code reads data from a local CSV file and uses the `d3.csv` API to load it.