This example presents a bubble chart of religious affiliation by country, using circle size to encode population counts. It is built with the Vega-Lite API, demonstrating programmatic chart construction through chained method calls like `vl.markCircle()` and `vl.size().fieldQ('population')`. The visualization reads data from a CSV file via `d3.csv`, registers tooltips through `vega-tooltip`'s `Handler`, and renders as an SVG. The code configures axis styling and figure dimensions, with a dark color scheme for readability.