A biohazard refers to any biological substance that poses a threat to the health of living organisms, primarily humans. This can include pathogens like bacteria, viruses, and fungi, as well as biological materials such as blood or other bodily fluids that may carry infectious agents. Biohazards are often categorized into different risk levels based on their potential to cause harm. To manage biohazards, strict safety protocols and regulations are implemented in laboratories and healthcare settings. Organizations like the Centers for Disease Control and Prevention (CDC) provide guidelines for handling and disposing of biohazardous materials to prevent contamination and protect public health.