This visualization tracks daily new COVID-19 cases per country during May 2020, with each country rendered as a colored line over time. The data comes from a Kaggle-hosted CSV and is loaded using `d3.csv` via the `getData` function. The chart is built with the Vega-Lite API, calling `vl.markLine()` with temporal x-axis and quantitative y-axis encodings, while country names drive the color channel. Tooltips display exact case counts and locations. The visualization uses vega-lite-api’s `register` method with vega and vega-lite, and renders as an SVG fitted to the viewport.