Adequate hand hygiene is one of the everyday measures recommended by the World Health Organization (WHO) to help combat Covid-19. Accordingly, Samsung has developed the 'Hand Wash' app for its watches. It promotes this activity through regular reminders, a tracker and a corresponding watch-face.
https://www.notebookcheck.net/Samsung-launches-a-hand-washing-app-for-its-smartwatches.461960.0.html