This example visualizes population data for various countries as a horizontal bar chart, using bar length to represent population size. The chart employs D3.js v6 with SVG rendering for drawing the chart elements, axes, and tick labels. It utilizes `scaleLinear` for the x-axis, `scaleBand` for the categorical y-axis, and `format` with custom logic to display large numbers in compact notation (e.g., converting 'G' to 'B'). The data is loaded asynchronously and processed to set domain ranges and render bars with tooltips.