A pie chart visualizes the distribution of students across majors, with each slice sized by the total number of students in that major. Hovering over a slice pops it outward and displays a tooltip breaking down the count of students with high, medium, and low stress levels for that major. Clicking a slice updates a text box below the chart with the major’s name and total student count. The visualization uses d3.pie, d3.arc, and d3.rollup to process CSV data and render SVG paths, with transitions animating the slice offset on hover.