This visualization displays the top 10 countries by total COVID-19 cases as a horizontal bar chart, with country names on the y-axis and case counts on the x-axis. The bars are rendered as SVG rectangles using React and D3 v5, with scales created via `d3.scaleBand` and `d3.scaleLinear`. Data is loaded asynchronously from a CSV file using `d3.csv`, and axes are drawn manually with gridlines and tick labels. The title indicates the chart focuses on the highest COVID-19 case counts among nations.