This stacked bar chart visualizes the distribution of smartphone sales across five price categories for ten brands, with each bar normalized to show proportions of total sales. The D3.js v7 code loads data from a CSV file and renders an SVG visualization, using `d3.stack()` to create stacked segments, `d3.scaleOrdinal()` for color mapping, and `d3.axisBottom()` with percentage tick formatting. Interactive tooltips display the exact percentage for each segment on hover, while a legend identifies the color-coded categories.