The Occupational Safety and Health Administration (OSHA) defines PPE as a "device or garment worn by a worker for protection against hazards in the work environment." There are four categories of PPE, including Personal Protective Equipment, Respiratory Protection, Eye and Face Protection, and Head Protection. OSHA requires that employers provide their employees with appropriate PPE to protect them from workplace hazards. Workers must be trained on how to use the equipment properly before they can use it at work.