A stacked bar chart shows the percentage distribution of five IMDb rating levels across six movie genres, with each bar segment colored by rating category. D3 v7 builds the visualization using `d3.stack()` for data stacking, `d3.scaleLinear` and `d3.scaleBand` for axes, and `d3.scaleOrdinal` for colors. Hovering over a segment reveals a tooltip displaying the precise percentage for that genre and rating level, while the SVG renders the chart with horizontal bars and labeled axes.