This example presents a stacked bar chart that compares the proportion of customer ratings across six technology product categories, including Smartphones, Laptops, and Tablets. The chart shows how ratings are distributed across six defined score ranges, from below 5.0 to above 9.0. Built with D3.js v7, the visualization loads data from a local CSV file and uses `d3.csv` to parse it. The chart employs `d3.scaleBand` for the categorical x-axis and `d3.scaleLinear` for the y-axis, with `d3.stack` to create the stacked segments and `d3.schemeSet2` for the color palette.