A mask is a simple means to prevent the spread of the disease to your surroundings. For healthy individuals, an ordinary mask does not have the same protective effect as special masks with nanofibers (with possible copper or silver elements) or the standard FFP2 and FFP3 respirators. How much can masks help against the influenza, (corona)viruses, or bacteria? What are their advantages and disadvantages? Read on to learn how to best protect yourself.