This bar chart displays the top 10 most populous countries using 2018 population estimates from the United Nations World Population Prospects 2017. It demonstrates customized D3 axes, including a formatted x-axis that abbreviates large numbers (e.g., converting billions to “B”) and grid lines, while the y-axis removes its domain line and ticks. Built with D3 v5, the visualization uses `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft`, rendering SVG elements. Population values are multiplied by 1,000 during data loading to convert units.