This bar chart visualizes the populations of the top twelve countries in 2020, using horizontal bars sorted by population size. Built with D3.js v7 and rendered as an SVG, the chart applies `scaleLinear` for the x-axis and `scaleBand` for the categorical y-axis. It uses `axisLeft` and `axisBottom` to generate axes, with custom tick formatting to display billions. The data is loaded from a CSV file, and CSS classes style the title and axis labels.