This stylized bar chart visualizes the top 10 most populous countries using a horizontal bar layout with a custom label for the population axis. The chart renders in SVG via React, with bars colored in blue and axis ticks styled in muted gray. The code uses D3 v5 APIs such as `scaleBand`, `scaleLinear`, `max`, and `format`, along with React hooks (`useState`, `useEffect`) to load data. The population values come from the United Nations World Population Prospects 2019 dataset, fetched as CSV and formatted in billions with a custom tick formatter.