A horizontal bar chart displays population estimates for the most populous countries, using data from the 2017 United Nations World Population Prospects. The chart encodes population with a linear scale and country names with a band scale to position bars. Rendered as SVG, the visualization uses D3 v6 modules including `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom`, with data loaded via `d3.csv`. The bars are styled with steelblue fill, and the chart includes labeled axes with margins applied.