This visualization shows the distribution of employees across departments using a pie chart, with each slice representing a department and sized by its employee count. The chart renders in SVG using d3.pie and d3.arc, while d3.rollup aggregates the CSV data from a GitHub gist to count records per department. A separate legend on the right maps each department to its color from d3.schemeSet3, and tooltips display the department name and count on hover.