This example shows sales data for supermarket orders, broken down by city, with stacked bars representing categories like Furniture, Office Supplies, and Technology. A dropdown menu filters the display by customer segment, and a checkbox toggles between sorting bars by total sales or by city order. Built with React and D3 v5, it uses `d3.stack`, `d3.scaleBand`, and `d3.scaleLinear` to render the SVG chart, with `transition` methods animating updates when filters change. The data comes from a CSV file containing individual order records.