Wearing masks in high traffic public places has become an important measure to help slow the spread of COVID-19. Masks are designed to cover the nose and mouth, which helps to prevent the spread of respiratory droplets that can carry the virus. These droplets can be expelled when an infected person talks, coughs, or sneezes, and can linger in the air for a period of time. Wearing a mask can also protect the person wearing the mask from inhaling these droplets.