This visualization displays the top 20 countries by COVID-19 cases using horizontal bars, with country names on the y-axis and case counts on the x-axis. Built with React and D3 v5, it uses `d3.csv` to load data, `scaleBand` and `scaleLinear` for positioning, and renders SVG rectangles and axes through React components. The chart pulls from a GitHub-hosted CSV file and updates state asynchronously with React hooks, showing a loading message before the data appears.