This bar chart visualizes population by country for 2015, using the Vega-Lite grammar to map countries to the x-axis and population to the y-axis. Built with the `vega-lite-api` and rendered via the `vega` and `vega-lite` libraries, it loads data from a CSV file using `d3.csv` and displays interactive tooltips via `vega-tooltip`'s Handler. The chart is styled with a custom config for improved readability.