This bar chart shows the populations of the top 10 most populous countries, based on 2018 estimates from the United Nations World Population Prospects 2017. It demonstrates axis customization using D3 v5, including formatted tick labels that convert large numbers into abbreviated values with ‘B’ for billions, horizontal gridlines, and custom axis labels. The chart is rendered as an SVG using D3’s `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft`, with data loaded from a CSV file. The longest bar reaches China’s population of over 1.4 billion.