This bar chart displays the population of the top 10 most populous countries, based on 2018 estimates from the United Nations World Population Prospects. It demonstrates customizing D3 axes: the y-axis has its domain line and tick lines removed, while the x-axis uses a tick format function to abbreviate large numbers and adds a custom axis label. The chart uses `d3.csv`, `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft`. Population values are multiplied by 1000, and bars are rendered as SVG rectangles with steelblue fill.