The Hazard Communication standard establishes requirements to ensure information about chemical hazards is provided to employers and employees. It was originally ordered by Congress in 1985 and updated in 2012 to align with the Global Harmonization System. The standard covers definitions, hazard classification, written hazard communication programs, labeling, safety data sheets, and employee training requirements. It aims to ensure hazards of chemicals are evaluated and hazard information is transmitted to protect worker safety.