This example displays a line chart of COVID-19 daily new cases over time, with interactive data points. It uses D3 v6 to load CSV data from a local file, parse dates, and render the chart with axes, a line path, and circles for each data point. Hovering over a circle triggers a tooltip that shows the specific date and case count. The visualization is built with D3's `scaleTime`, `scaleLinear`, `line`, `axisBottom`, and `axisLeft` APIs, and rendered as SVG with a title header.