This example uses the Vega-Lite API to render a bubble chart of Bluebikes station data, with the x-axis showing "Total docks" and the y-axis showing the "District". The circles are sized and colored by the number of docks, and a tooltip reveals details like station name and capacity. The code loads the tooltip, config, and data modules, with the data fetched from a remote CSV using `d3.csv`. The visualization is rendered to SVG, and the `viz.js` file defines the mark and encodings.