This bar chart displays the population of the top 10 most populous countries, using 2018 estimates from the United Nations World Population Prospects. The code demonstrates customizing D3 axes using `d3.axisBottom` and `d3.axisLeft`, with tick formatting via `d3.format` to abbreviate large numbers. It loads data from a CSV file with `d3.csv`, scales bars with `d3.scaleLinear` and `d3.scaleBand`, and renders the chart as SVG. The chart includes a title, axis labels, and grid lines, all styled with steelblue bars.