This bar chart displays the population of the top 30 countries in 2020, sorted by country name along the y-axis and population along the x-axis. The visualization uses D3.js v5 scale functions with React components for each chart element, including custom axes for tick marks and labels. Population values are formatted with a compact notation that converts billions (G) to billions (B) for tick labels and tooltips. The data is loaded as a CSV file from a GitHub gist, and the chart renders as an SVG with CSS styling for tick lines and bar fills.