DRK stands for Deutsches Rotes Kreuz – the German branch of the International Red Cross and Red Crescent Movement.
It is an organisation that is made up of volunteers as well as part- or fulltime employees. They not only offer first aid courses and medical assistance at large events, but often Hausnotruf – an emergency service for elderly people, meals on wheels, and organise blood donation sessions (Blutspende).
To hear a simple explanation and a short discussion in German, listen to the podcast:
(Press the “play” button to listen to the podcast)