Biosecurity involves protecting against biological threats, ensuring the safety of people, animals and the environment. Historically, biosecurity emerged in response to the spread of infectious diseases and pests. Biological threat agents, such as viruses, bacteria, and parasites, pose significant risks to agriculture, livestock, and public health. Laboratories follow strict biosecurity measures to prevent the accidental release of harmful agents. In aquaculture, biosecurity prevents disease transmission among aquatic species. Poultry, livestock, and crop biosecurity protect against pathogens that can devastate the industries. In healthcare, biosecurity safeguards against infectious outbreaks. In food production, biosecurity ensures the safety of the food supply chain. Forestry biosecurity addresses pests and diseases that affect forests. International trade plays a crucial role in the spread of biological threats, making global cooperation and stringent biosecurity measures vital for protecting public health and economies.