A horizontal bar chart displays the top 10 most populous countries, with population in millions on the x-axis and country names on the y-axis. The example highlights customized axes: the y-axis removes its domain and tick lines, while the x-axis uses a custom tick format that converts values from 'G' to 'B' for billions. D3's `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft` are used, with data loaded from a CSV file.