This stacked bar chart visualizes the distribution of religious affiliations across countries, with bar length representing population and color encoding religion. The visualization uses d3 v5's CSV loader to fetch data from the UCI Machine Learning Repository via a Gist, then renders the chart through the Vega-Lite API, which translates specifications into executable Vega views. The chart sorts countries by total population and includes tooltips that display population values on hover, while a custom config adjusts axis labels and font styling for improved readability.