This pie chart displays the top 25 countries with confirmed COVID-19 cases, using a categorical color scale to distinguish each nation. The visualization is rendered as an SVG with a legend listing country names and case counts in thousands. Built with D3 v5, the code uses `d3.pie` and `d3.arc` to generate segments, `d3.scaleOrdinal` for colors, and `d3.csv` to load data from a GitHub gist.