This pie chart displays the survival distribution of Titanic passengers, splitting the data into "Survived" and "Did Not Survive" categories. It uses D3.js v7 to load a CSV from a GitHub repository, filter for valid survival entries, and render an SVG pie chart with an ordinal color scale. The code explicitly calls `d3.pie()`, `d3.arc()`, and `d3.scaleOrdinal()` to construct the arcs, labels, and legend.