A bar chart displays the top 10 countries by total COVID-19 cases, with country names labeled along the vertical axis and case counts on the horizontal axis. The visualization is built with React and D3 v5, using `csv` to load data, `scaleBand` for the categorical y-axis, and `scaleLinear` for the numeric x-axis. SVG rectangles are rendered for each bar, with axes and tick marks generated manually via D3's `max` and `format` functions.