A bar chart displays monthly sales for 100 coffee shop branches, with each bar colored on a sequential blue scale to encode sales magnitude. Using D3 v7 within a React component, the visualization loads data from a CSV file via `d3.csv`, aggregates it, and renders SVG rectangles scaled with `scaleBand` and `scaleLinear`. Branch labels are rotated on the x-axis, and axes are drawn with `axisBottom` and `axisLeft`, with hover effects changing bar color to orange.