This example shows a bar chart of population by country, using data loaded from a CSV file. The visualization is built with Vega-Lite and the Vega-Lite API, with D3.js handling data fetching. It uses the `vl.markBar()` method to encode the country field on the x-axis and population on the y-axis, with tooltips displaying population values. The chart auto-sizes to fill the browser window and applies custom axis and label styling for readability.