This example visualizes the top 20 countries by religious population, using a bar chart where each bar is colored by country and sorted by population in descending order. Built with the Vega-Lite API v2, it registers with Vega and Vega-Lite, uses D3's `csv` to fetch data from a GitHub gist, and applies D3's `format` to round population values. The chart renders responsively to the window size, with custom axis styling and an interactive tooltip showing country and population details.