This example analyzes COVID-19 data from a CSV file, displaying a pie chart of confirmed cases by WHO region and a group bar chart of cases for the top ten countries. The pie chart uses `d3.pie` and `d3.arc` to render segments with an ordinal color scheme. The bar chart uses `d3.scaleBand` and `d3.scaleLinear` to draw grouped rectangles for confirmed, deaths, and recovered counts. Both charts are rendered as SVGs, with axes, legends, and labels generated via `d3.axisBottom` and `d3.axisLeft`.