This bar chart displays the population of each country in 2015, sorted in descending order to highlight the most populous nations. The visualization is built using the Vega-Lite API within a D3.js framework, leveraging `vl.markBar()` and encoding country names and population values as x and y axes. Data is fetched asynchronously via D3’s `csv` loader from a GitHub-hosted CSV file. The chart renders at full window size with a custom dark theme, using Vega-Lite’s configuration to remove axis domains and adjust label styling for readability.