This visualization presents retail sales trends for Electronics, Clothing, and Groceries across 150 months using a multi-series line chart. The top panel displays three colored lines representing each product category, while the bottom panel combines a gray bar chart of total sales with an overlaid blue line for Electronics. The example uses D3 v7 (d3.v7) with the scaleLinear, scaleBand, axisBottom, axisLeft, line, and csv APIs to render interactive-free SVG charts. Data is loaded from a local CSV file, and colors are assigned via d3.scaleOrdinal.