A face mask is a protective garment that covers the face (especially the nose and mouth), primarily used to block airborne particles, bacteria, viruses, or other harmful substances to reduce the risk of respiratory infections.
The main functions of a face mask are:
Blocking droplets: Preventing droplets produced by the wearer's breathing, talking, or coughing from spreading outwards.
Filtering inhaled air: Reducing the inhalation of harmful particles such as bacteria, viruses, and dust.
Protecting others: During an infectious disease outbreak, wearing a face mask can reduce the probability of virus transmission.