This example presents COVID-19 statistics through two coordinated D3 v7 visualizations: a pie chart and a bar chart. The pie chart breaks down global confirmed cases by WHO Region, while the bar chart displays confirmed cases per country. Both visualizations load data from the same CSV file using `d3.csv` and update interactively via mouseover tooltips showing detailed case counts. The charts use `d3.pie`, `d3.arc`, `d3.scaleBand`, and `d3.scaleLinear` to render SVG elements, with `d3.schemeCategory10` providing distinct colors for categorical data.