This interactive radial stacked bar chart displays the estimated religious breakdown of the most populous 20 countries in 2010, based on data from the Pew Research Center. Users can select a country from a dropdown menu to view its population distribution across six religious categories, with hover interactions on the legend highlighting specific religions. Built with D3.js, the visualization uses `scaleBand` and `scaleRadial` to map religions to angular segments and population to radial distances, while `d3.stack` processes the grouped data for layered arcs rendered as SVG paths with animated transitions.