The app functions by recording your movements, for some a strange feeling at first, however, the data remains stored only on your device until you decide to share it — in case that you contract the Coronavirus.
The app then determines your prior whereabouts to notify people you have met — if they also have this app — that they had a risk contact.
We see using the app as an opportunity to help protect both our team and customers, which is what Corona-Warn was created for: To protect the health of all of us.