This bar chart displays the population of the top 10 most populous countries, with each bar’s length proportional to its population in millions. The chart uses D3 version 5 with an SVG rendering approach, employing `scaleLinear` for the x-axis, `scaleBand` for the y-axis, and `axisLeft` and `axisBottom` to generate axes. Data is loaded from a CSV file via `d3.csv`, with population values multiplied by one million. Axis tick labels are formatted using `format`, abbreviating large numbers with a custom function that replaces "G" with "B".