This bar chart displays the population of the world’s most populous countries, ranked vertically from China to Slovenia, with horizontal bars indicating relative population sizes. It uses D3 v5’s `scaleLinear` and `scaleBand` to map population values and country names, respectively, while rendering as SVG. The code loads CSV data via `d3.csv`, applies a custom tick formatter to abbreviate large numbers (e.g., converting billions), and styles bars with steelblue fill.