A bar chart displays the population of the ten most populous countries, using horizontal bars scaled linearly by population and sorted by rank. The visualization emphasizes custom axis styling: the y-axis removes its domain line and ticks, while the x-axis uses a custom tick formatter to abbreviate large numbers (e.g., converting billions to 'B') and includes a labeled "Population" axis title. A D3 v7 script loads data from a CSV, applies a band scale for countries and a linear scale for populations, and renders SVG rectangles with margins and gridlines via `axisBottom` and `axisLeft`.