The document defines hazards as anything with the potential to cause harm and lists biological, chemical, mechanical, physical, and psychological as examples of hazards found in beauty salons. It then provides examples of hazards for each category, such as bacteria and viruses for biological hazards, poisons and chemicals for chemical hazards, and overwork and harassment for psychological hazards. The document also defines risk as exposure to danger and occupational health and safety as a system to prevent illness and injury at work by recognizing hazards and risks.