This example visualizes the population of countries in 2015 using a bar chart, with countries sorted in descending order of population. The visualization is built with the Vega-Lite API, which registers Vega and Vega-Lite libraries, and uses D3’s `csv` loader to fetch the dataset from a GitHub gist. The chart renders in an SVG view, with a tooltip from `vega-tooltip` to display population values on hover, and uses a custom config for axis and label styling.