Biological hazards refer to harmful biological substances that can pose risks to human health. These include bacteria, viruses, fungi, and parasites that can cause diseases. Common examples are Salmonella in contaminated food, HIV in blood, and influenza viruses that spread through respiratory droplets. Exposure to biological hazards can occur in various settings, such as workplaces, healthcare facilities, and during natural disasters. Proper safety measures, including personal protective equipment (PPE) and hygiene practices, are essential to minimize the risk of infection and ensure public health safety.