The document discusses unsafe acts and unsafe conditions, which are the two main causes of accidents. Unsafe acts refer to violations of rules or procedures by workers, while unsafe conditions are hazards in the workplace that could cause injury. Most accidents are caused by human failure through unsafe acts rather than equipment failures. Common unsafe acts include taking shortcuts, lack of training, or ignoring safety procedures. Unsafe conditions may include poor lighting, oxygen deficiencies, or improperly guarded machinery. To reduce unsafe acts and conditions, workplaces should conduct regular inspections, provide safety training, and promote a culture of reporting issues.