This stacked bar chart displays the distribution of five technology job roles across four experience levels (Entry Level, Intermediate, Senior, and Expert). The chart uses d3.stack() to calculate cumulative segment heights and d3.scaleOrdinal with the d3.schemeCategory10 palette for color encoding categories. d3.axisBottom and d3.axisLeft generate the axes, while the SVG rectangles respond to mouseover events to trigger a custom tooltip, loaded from a local data.csv file.