This bar chart displays the population of the top 10 most populous countries using 2018 estimates from the United Nations World Population Prospects 2017. It demonstrates how to customize D3 axes, including styling and formatting of tick marks and labels. The code uses D3 v5’s `scaleLinear` for the x-axis, `scaleBand` for the y-axis, and `csv` to load the data, rendering SVGs with `select` and `append`. The example builds on a basic bar chart tutorial, showing enhanced axis configuration.