This example demonstrates a horizontal bar chart of population data for selected countries, with customized axis formatting. The visualization uses a linear scale for population values and a band scale for country names, rendering bars as SVG rectangles filled with steelblue. It customizes the x-axis tick labels using `d3.format` to abbreviate large numbers with SI prefixes, while the y-axis displays country names. Data is loaded from a CSV file using `d3.csv`, and the chart layout applies explicit margins and padding.