A more thorough explanation:

The Occupational Safety and Health Act of 1970 (OSHA) is a federal law that requires employers to provide a safe and healthy workplace for their employees. This means that employers must identify and eliminate any hazards that could cause serious harm or death to their workers. They must also follow safety standards set by the Secretary of Labor.

For example, if an employer operates a factory where workers are exposed to dangerous chemicals, they must provide protective gear and ensure that the chemicals are stored and handled safely. If an employer operates a construction site, they must provide safety equipment such as hard hats and harnesses, and ensure that workers are trained to use them properly.

OSHA applies to all employers in the United States, including those in Puerto Rico and other territories. It covers an estimated 5 million workplaces and 75 million employees.