A mask is a covering worn on the face, often used to conceal one's identity or to portray a character. Masks can be made from various materials, including paper, plastic, or fabric, and are commonly associated with celebrations, performances, and rituals. They are often used in theater, such as in commedia dell'arte, where actors wear masks to represent specific characters. In addition to entertainment, masks have cultural significance in many societies. For example, African tribal masks are used in ceremonies and rituals, symbolizing spiritual beliefs. Masks can also serve practical purposes, such as in medical settings, where they protect against airborne pathogens.