This D3.js pie chart displays global internet usage by country, with each slice representing a country and its corresponding number of users. The visualization loads data from a remote CSV file and uses `d3.pie`, `d3.arc`, and `d3.scaleOrdinal` with `d3.schemeCategory10` for coloring. Labels are positioned using a custom `labelArc`, and an HTML legend is built dynamically. The SVG chart is rendered with D3's selection and data-binding methods, while styling is applied through external CSS.