This example visualizes the top 10 countries by 2020 population using a bar chart, with countries arranged vertically and population values mapped to bar widths. The visualization is built with React and D3 v7, loading data from a CSV file via `d3.csv`. Scales are created using `scaleBand` for the categorical y-axis and `scaleLinear` for the numeric x-axis, with bars rendered as SVG `<rect>` elements inside a transformed group. The chart fills the browser window and updates dynamically once the data loads.