This bar chart visualizes the top 10 most populous countries in 2019 using UN population data. Built with React and D3 v7, the example loads CSV data via `d3.csv` and renders horizontal bars with SVG, including country flags displayed at the end of each bar using `<image>` elements. The chart uses `scaleBand` for the categorical y-axis and `scaleLinear` for the quantitative x-axis, with gridlines and tick labels generated from the scales.