A mask is a personal protective equipment (PPE) worn on the face to:

- Protect against airborne diseases (e.g., COVID-19)
- Filter out particles and pollutants
- Conceal one's identity (e.g., in costumes or disguises)
- Protect from hazardous materials (e.g., in industrial or medical settings)

Types of masks include:

- Surgical masks
- Respirator masks (e.g., N95)
- Cloth masks
- Gas masks
- Dust masks

Masks have become an essential tool in public health, helping prevent the spread of infectious diseases. They also serve various purposes in industries like healthcare, construction, and entertainment.

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