This bar chart shows the populations of the top 10 most populous countries, using a horizontal layout with population on the x-axis and country names on the y-axis. The example demonstrates customizing axes by removing default tick lines, adding a custom tick format that converts G to B, and including custom axis labels. Built with D3 v4, it uses d3.scaleLinear, d3.scaleBand, d3.axisBottom, and d3.axisLeft to render the SVG visualization from a CSV data file.