The data for countries comes from the Johns Hopkins University’s dashboard and CSSE COVID-19 dataset. The data for UK nations, regions, and local authorities come from https://coronavirus.data.gov.uk/. Data are updated daily.
There are various options – explore them by selecting appropriate buttons.
You can right-click on a chart to save it as an image. The rectangular chart option gives a chart suitable for posting on Twitter. The square chart option allows more detailed study.