Masks can refer to various things, such as:

1. Facial masks: worn to conceal one's identity, protect against airborne diseases, or as a fashion statement.
2. Theater masks: used in ancient Greek theater to represent different characters and emotions.
3. Cultural masks: used in various cultures for ceremonial, spiritual, or decorative purposes.
4. Surgical masks: worn by medical professionals to prevent the spread of germs and diseases.
5. Gas masks: used to protect against toxic gases and chemicals.
6. Virtual masks: used online to conceal one's identity or create a virtual persona.