This stylized bar chart displays the ten most populous countries according to the UN’s 2019 World Population Prospects, using a horizontal layout with a reversed y-axis. Built with React and rendered as SVG, it uses `scaleBand` for the categorical country axis and `scaleLinear` for the population values, with bars styled in a teal color. The chart includes formatted tick labels (e.g., “1.4B”) via a custom `format` function, and hover tooltips show the precise population. The code is structured into separate components for axes and marks, demonstrating a modular React approach to D3 visualization.