This example shows a bar chart of population data for the top 10 countries in 2020, loaded from a CSV file and rendered as SVG rectangles. The app uses React hooks (useState, useEffect) to fetch and store the data, then maps it to bars with d3.scaleBand for the y-axis and d3.scaleLinear for the x-axis. Bars are positioned using the yScale and sized by xScale on population values, with the chart filling the entire window.